SDK-412 UUA Naming inconsistencies

[joaodordio]

JIRA Ticket(s) if any

• SDK-412

Description

Aligns the Web SDK with the cross-SDK Unknown User Activation (UUA) naming convention. No behavior changes. Old public surface kept as deprecated aliases; legacy on-disk data is migrated transparently on first read.

Renames

• Config flag: enableUnknownActivation is now enableUnknownUserActivation. Old name kept as a deprecated alias; if both are supplied, the new one wins. Setting the legacy name emits a console.warn.
• localStorage key: unknown_userId is now itbl_userid_unknown (matches the itbl_* convention used by every other Web key).
• Session storage JSON fields inside itbl_unknown_sessions: number_of_sessions / first_session / last_session are now totalUnknownSessionCount / firstUnknownSession / lastUnknownSession (already what the payload types and backend expect; the rename layer in createUnknownUser is gone).
• Constant: AUA_WARNING is now UUA_WARNING. Old export kept as a deprecated alias.

Migrations

• New migrateLegacyKey(oldKey, newKey) helper in utils/commonFunctions.ts, invoked once at SDK init for the unknown user id key.
• updateUnknownSession reads legacy snake_case fields as fallback and rewrites under the new camelCase keys.

Tests

• New commonFunctions.test.ts covering the migration helper (idempotent, no overwrite of new key, no-op when neither exists).
• New tests in config.test.ts for the deprecated config alias path.
• New session field migration test in unknownUserEventManager.test.ts.
• README and react-example updated.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.19608% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.56%. Comparing base (190a168) to head (d5da516).

Files with missing lines	Patch %	Lines
src/unknownUserTracking/unknownUserEventManager.ts	78.57%	3 Missing ⚠️
src/commerce/commerce.ts	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #576      +/-   ##
==========================================
+ Coverage   74.45%   74.56%   +0.11%     
==========================================
  Files          57       57              
  Lines        2736     2760      +24     
  Branches      798      811      +13     
==========================================
+ Hits         2037     2058      +21     
- Misses        698      701       +3     
  Partials        1        1              

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