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What does this PR do?
Corrects a problem where proxies would flood the event bus and cause a pegged CPU when syncing grains.
What issues does this PR fix or reference?
Fixes #31728 and #31791.
Previous Behavior
Syncing grains for proxy would cause a recursive loop (event posted to bus, proxy reacts to event that would post same event to bus, etc)
New Behavior
Grains syncing and custom grains for proxies work without flooding the event bus.
Tests written?