Add validation to allowed directories on config load #5423

Job	Run time
Lint	5m 27s
Unit Tests	2m 29s
Unit tests with race condition detection	3m 2s
Build Unsigned Snapshot	2m 12s
Performance Tests	7m 28s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	7m 44s
Integration Tests - Official OSS Images (bookworm, stable, debian)	7m 50s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	7m 47s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	7m 47s
Load Tests	4m 53s
Integration Tests (alpine, 3.22)	7m 16s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	7m 49s
Integration Tests (redhatenterprise, 9)	9m 5s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	7m 25s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	7m 53s
Integration Tests - Official OSS Images (alpine, stable, alpine)	7m 26s
Integration Tests (ubuntu, 24.04)	9m 11s
	1h 52m 44s

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