Add validation to allowed directories on config load #5403

Job	Run time
Build Unsigned Snapshot	2m 9s
Unit tests with race condition detection	2m 44s
Lint	4m 29s
Performance Tests	7m 16s
Unit Tests	2m 21s
Integration Tests (redhatenterprise, 9)	8m 53s
Integration Tests (alpine, 3.22)	7m 0s
Load Tests	4m 37s
Integration Tests - Official OSS Images (bookworm, stable, debian)	7m 48s
Integration Tests (ubuntu, 24.04)	8m 37s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	7m 46s
Integration Tests - Official OSS Images (alpine, stable, alpine)	7m 36s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	7m 18s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	7m 17s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	7m 56s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	7m 35s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	8m 8s
	1h 49m 30s

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