Removed themeErrorsNotification lab flag

[EvanHahn]

ref c7230f1

This flag has been in GA for over 3 years, so we can remove all related code. (There wasn't much left.)

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Walkthrough

The changes remove the themeErrorsNotification feature flag from two locations: the default lab flags in test acceptance configuration and the GA_FEATURES constant in the shared labs module. This eliminates the flag from the set of features enabled during tests and from the public-facing feature flags export via GA_KEYS.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title accurately summarizes the main change: removal of the themeErrorsNotification lab flag, which is confirmed by both file changes.
Description check	✅ Passed	The pull request description is related to the changeset, providing context that the flag has been in GA for over 3 years and explaining the rationale for removal.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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