Fix watcher & resource race conditions #4618

Job	Run time
Lint	4m 6s
Unit tests with race condition detection	2m 31s
Unit Tests	2m 7s
Build Unsigned Snapshot	1m 45s
Performance Tests	4m 35s
Load Tests	4m 24s
Integration Tests (ubuntu, 22.04)	3m 46s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	2m 19s
Integration Tests (redhatenterprise, 9)	3m 44s
Integration Tests - Official OSS Images (bookworm, stable, debian)	2m 4s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	2m 18s
Integration Tests (alpine, 3.19)	2m 55s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	2m 19s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	2m 23s
Integration Tests - Official OSS Images (alpine, stable, alpine)	2m 13s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	2m 33s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	2m 0s
Publish NGINX Agent v3 packages	0s
	48m 2s

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