Stop caching tag_names with cache_method_as_redis_set

Javiera Tapiarequested to merge
jtapiab/577418-stop-caching-repository-tag_names into master

What does this MR do and why?

This MR introduces a feature flag mechanism to conditionally disable Redis caching for the tag_names method in the Repository model.

  • Adds a new feature flag avoid_tag_names_cache that allows bypassing the Redis cache for repository tag names.
  • When the feature flag is enabled, tag_names calls go directly to the raw repository instead of using the Redis cache.
  • Updates both the main tag_names method and the tag_names_include? helper method to respect the cache bypass.

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Related to #577418 (closed)

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