[WIP] useOnyxGet with snapshot

[LukasMod]

Explanation of Change

Stacked on #102135

• New useSnapshotOnyxGet() hook (src/hooks/useSnapshotOnyxGet.ts) returns a reader for Search snapshot keys (CONST.SEARCH.SNAPSHOT_ONYX_KEYS), for use in event handlers. Inside a Search scope the reader reads the key from the active snapshot_<hash>, the same place useOnyx would, without subscribing. Until now Onyx.get was banned on these keys because it would return live data where the component shows the snapshot.
• SearchResultsProvider now provides SearchSnapshotHashContext, a plain number set to the active snapshot hash, or undefined on to-do searches that show live data. The hook reads only this number, so it re-renders only when the search changes. In a manual probe run while scrolling Spend > Expenses, a component on this context rendered once, while one reading SearchQueryContext and SearchResultsContext rendered with each pagination.
• useOnyx now reads its snapshot hash from SearchSnapshotHashContext too, instead of SearchQueryContext and SearchResultsContext, so the snapshot condition lives only in SearchResultsProvider and both hooks resolve the same snapshot. The condition itself is unchanged.
• useOnyx.ts exports getKeyData and the new isSnapshotCompatibleKey, so both hooks share them. getKeyData now accepts OnyxEntry<SearchResults>.
• no-unsafe-onyx-read now tracks readers created with const getOnyx = useSnapshotOnyxGet(), including local copies and inline useSnapshotOnyxGet()(key) calls. A reader call is flagged when the key isn't a snapshot key (use Onyx.get for those), when the key can't be resolved, or when the call happens during render or in an effect. The reader also can't leave the component: passing it as a prop or argument, returning it, or putting it in an object is flagged, because the rule can't follow it there. Listing it in a hook dependency array is allowed. The Onyx.get snapshot-key error now tells the developer to use useSnapshotOnyxGet(). src/hooks/useSnapshotOnyxGet.ts itself is exempt from the key checks only.
• No production component uses the hook yet, so the only runtime change in the app is the extra provider.

Fixed Issues

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PROPOSAL:

Tests

• Verify that no errors appear in the JS console

Offline tests

QA Steps

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
• I ran the tests on all platforms & verified they passed on:
  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
• I verified there are no new alerts related to the canBeMissing param for useOnyx
• I followed proper code patterns (see Reviewing the code)
  • I verified that any callback methods that were added or modified are named for what the method does and never what callback they handle (i.e. toggleReport and not onIconClick)
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    • If any non-english text was added/modified, I used JaimeGPT to get English > Spanish translation. I then posted it in #expensify-open-source and it was approved by an internal Expensify engineer. Link to Slack message:
  • I verified all numbers, amounts, dates and phone numbers shown in the product are using the localization methods
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• If a new code pattern is added I verified it was agreed to be used by multiple Expensify engineers
• I followed the guidelines as stated in the Review Guidelines
• I tested other components that can be impacted by my changes (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar are working as expected)
• I verified all code is DRY (the PR doesn't include any logic written more than once, with the exception of tests)
• I verified any variables that can be defined as constants (ie. in CONST.ts or at the top of the file that uses the constant) are defined as such
• I verified that if a function's arguments changed that all usages have also been updated correctly
• If any new file was added I verified that:
  • The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
• If a new CSS style is added I verified that:
  • A similar style doesn't already exist
  • The style can't be created with an existing StyleUtils function (i.e. StyleUtils.getBackgroundAndBorderStyle(theme.componentBG))
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  • The assets load correctly across all supported platforms.
• If the PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
• If the PR modifies a generic component, I tested and verified that those changes do not break usages of that component in the rest of the App (i.e. if a shared library or component like Avatar is modified, I verified that Avatar is working as expected in all cases)
• If the PR modifies a component related to any of the existing Storybook stories, I tested and verified all stories for that component are still working as expected.
• If the PR modifies a component or page that can be accessed by a direct deeplink, I verified that the code functions as expected when the deeplink is used - from a logged in and logged out account.
• If the PR modifies the UI (e.g. new buttons, new UI components, changing the padding/spacing/sizing, moving components, etc) or modifies the form input styles:
  • I verified that all the inputs inside a form are aligned with each other.
  • I added Design label and/or tagged @Expensify/design so the design team can review the changes.
• If a new page is added, I verified it's using the ScrollView component to make it scrollable when more elements are added to the page.
• I added unit tests for any new feature or bug fix in this PR to help automatically prevent regressions in this user flow.
• If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.

Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[github-actions]

⚠️ This PR is possibly changing native code and/or updating libraries, it may cause problems with HybridApp. Please check if any patch updates are required in the HybridApp repo and run an AdHoc build to verify that HybridApp will not break. Ask Contributor Plus for help if you are not sure how to handle this. ⚠️