Fix : Compiler eslint suppression silent skip 35105

[manNomi]

Summary

This PR fixes #35105 where eslint-disable comments cause the React Compiler to skip entire functions, preventing important diagnostics like incompatible-library warnings from being shown.

Motivation: When developers add unrelated ESLint suppressions (e.g., for exhaustive-deps), the compiler would silently skip analyzing the entire function. This meant critical warnings about incompatible APIs would never reach the developer, leading to silent performance issues in production.

Solution: Implemented the "shorter term fix" suggested by @josephsavona - in ESLint mode (noEmit: true), suppressions are now logged as diagnostics but compilation continues to detect other issues. Build mode behavior is unchanged for backward compatibility.

Real-World Testing

As is	To be

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[josephsavona]

Thanks for the contribution. Your description says you "Created and ran a validation script that:" but...that script is not here. It is also unnecessary, since we have a testing framework. You (or the LLM you're clearly using) needs to actually run our tests :-)

[josephsavona]

see above

[josephsavona]

Still need to actually run tests and update fixtures

[manNomi]

Thank you for the feedback. I've addressed the issues you pointed out:

1. Removed the incorrect validation script claims from the PR description
2. Ran all local tests (yarn snap) - all 1796 tests passing
3. Updated fixtures with yarn snap --update

I apologize for the confusion with the initial PR description. I used an LLM to help with the write-up and didn't properly verify its output.

The changes now correctly implement the "shorter term fix" we discussed

Please let me know if anything else needs to be addressed.