Automatic merge from submit-queue
[GarbageCollector] measure latency
First commit is #27600.
In e2e tests, I measure the average time an item spend in the eventQueue(~1.5 ms), dirtyQueue(~13ms), and orphanQueue(~37ms). There is no stress test in e2e yet, so the number may not be useful.
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Automatic merge from submit-queue
pkg/controller/garbagecollector: simplify mutexes.
pkg/controller/garbagecollector: simplified synchronization and made idiomatic.
Similar to #29598, we can rely on the zero-value construction behavior
to embed `sync.Mutex` into parent structs.
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