Add validation to allowed directories on config load #5418

Job	Run time
Unit Tests	2m 21s
Performance Tests	7m 17s
Unit tests with race condition detection	2m 48s
Build Unsigned Snapshot	2m 5s
Lint	4m 52s
Integration Tests - Official OSS Images (alpine, stable, alpine)	7m 28s
Integration Tests (alpine, 3.22)	7m 0s
Integration Tests (ubuntu, 24.04)	8m 56s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	7m 17s
Load Tests	4m 47s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	8m 0s
Integration Tests (redhatenterprise, 9)	9m 29s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	7m 30s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	7m 36s
Integration Tests - Official OSS Images (bookworm, stable, debian)	7m 33s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	7m 49s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	7m 53s
	1h 50m 41s

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