Add validation to allowed directories on config load #5419

Job	Run time
Lint	4m 40s
Build Unsigned Snapshot	2m 14s
Unit Tests	2m 19s
Performance Tests	7m 20s
Unit tests with race condition detection	2m 47s
Integration Tests (alpine, 3.22)	7m 9s
Integration Tests (ubuntu, 24.04)	8m 55s
Integration Tests (redhatenterprise, 9)	8m 57s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	8m 1s
Integration Tests - Official OSS Images (bookworm, stable, debian)	7m 37s
Load Tests	5m 0s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	7m 17s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	7m 54s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	7m 39s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	7m 25s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	7m 43s
Integration Tests - Official OSS Images (alpine, stable, alpine)	7m 23s
	1h 50m 20s

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