Only invalidate the namespace cache once per request.

Closes #3406874

added 1 commit

• 3c44b773 - Add a test to validate reduced cache invalidation triggers.

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added 4 commits

• 3c44b773...6dfc108b - 3 commits from branch project:9.1.x
• 2aad9b15 - Merge branch '9.1.x' into 3406874-excessive-cache-invalidations

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added 3 commits

• e9f475ad - 1 commit from branch project:9.1.x
• 3304d6d3 - Only invalidate the namespace cache once per request.
• 7c978fde - Add a test to validate reduced cache invalidation triggers.

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merged