What does this PR do?

Adds integration tests for the FeatureRepository DI container to verify the @Memoize decorator behavior in CachedFeatureRepository.

The test exercises the getFeatureRepository() function from packages/features/di/containers/FeatureRepository.ts which returns a CachedFeatureRepository instance that uses @Memoize and @Unmemoize decorators for Redis caching.

Test coverage includes:

• Repository instance caching via DI container
• findBySlug with memoization
• findAll with memoization
• update with @Unmemoize cache invalidation
• checkIfFeatureIsEnabledGlobally

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. N/A - test only.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

Run the integration test locally:

VITEST_MODE=integration TZ=UTC yarn test packages/features/di/containers/FeatureRepository.integration-test.ts

Checklist

• My code follows the style guidelines of this project
• I have checked if my changes generate no new warnings

Link to Devin run: https://app.devin.ai/sessions/f702705bd61f4b98a2abc0c3cb26a7e3
Requested by: @eunjae-lee