ReactiveCaching#clear_reactive_cache! should not keep the cache alive

What does this MR do?

When calling ReactiveCaching#clear_reactive_cache! we only expire the key that holds the data and not the cache that says if the cache is outdated. This can result in getting multiple nil returns when the cache is supposedly "alive". By clearing the alive cache as well we are essentially trying to refresh the cache.

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Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer
  • Has been reviewed by a Backend maintainer
  • Has been reviewed by a Database specialist
• Conform by the merge request performance guides
• Conform by the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)