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What does this PR do?
Adds periodic cleanup of reactor client caches, exposes a reactor.cleanup runner to trigger cleanup on demand, and adds unit coverage for cache expiry behavior.
What issues does this PR fix or reference?
Fixes #68660
Previous Behavior
Reactor processes could retain cached client objects indefinitely, contributing to memory growth during sustained event processing.
New Behavior
Reactor periodically purges expired cache entries and can be asked to clean up immediately via salt-run reactor.cleanup.
Merge requirements satisfied?
[NOTICE] Bug fixes or features added to Salt require tests.
Commits signed with GPG?
No
Links referenced:
#68660