ci: fix TS canary failures

[pranavosu]

Problem

The scheduled Typescript Canary workflow has been failing on all three jobs (rc, next, latest) due to two issues introduced by newer TypeScript releases:

1. rc install fails. typescript@rc now resolves to TypeScript 7.0, whose package layout no longer includes lib/_tsc.js. Yarn's built-in TypeScript compat patch hard-codes that path and aborts the install with ENOENT ... _tsc.js. The patch only matters under the PnP linker; this repo uses nodeLinker: node-modules, so it provides no value here.
2. latest/next OOM. Suites pass, then a ts-jest worker exceeds V8's default (~4 GB) heap and crashes (JavaScript heap out of memory). Newer TS compilers use more memory type-checking this repo's generic-heavy types.

Changes

Both scoped to .github/workflows/callable-ts-version-unit-test.yml (used only by the canary). No source, dependencies, or published artifacts are affected.

• Waiting on Handle optional compat patch failures for TypeScript 7 yarnpkg/berry#7190 to land - fixing the rc install against the TS 7.0 layout.
• Set NODE_OPTIONS=--max-old-space-size=8192 on the test step, fixing the latest/next OOM.

Validation

• YAML validated locally.
• Test-infra-only change with no functional/runtime impact, so no new automated tests are required.
• https://github.com/aws-amplify/amplify-data/actions/runs/28626118135/job/84892889938

Checklist

• If this PR includes a functional change to the runtime or type-level behavior of the code, I have added or updated automated test coverage for this change. (N/A — CI/test-infra only.)
• If this PR requires a docs update, I have linked to that docs PR above. (N/A)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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