Update file watcher to only monitor directories referenced in the nginx configuration #5286

Job	Run time
Unit tests with race condition detection	2m 45s
Lint	4m 18s
Build Unsigned Snapshot	2m 0s
Unit Tests	2m 17s
Performance Tests	4m 55s
Integration Tests (redhatenterprise, 9)	7m 16s
Integration Tests (alpine, 3.19)	7m 1s
Integration Tests - Official OSS Images (bookworm, stable, debian)	7m 29s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	7m 30s
Integration Tests - Official OSS Images (alpine, stable, alpine)	7m 14s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	7m 8s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	7m 23s
Load Tests	4m 45s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	7m 19s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	7m 23s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	7m 22s
	1h 34m 5s

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