Update mock management to support external file server #5766

Job	Run time
Lint	3m 8s
Proxy Sanity Check	1m 57s
Unit tests with race condition detection	4m 39s
Performance Tests	8m 43s
Build Unsigned Snapshot	3m 12s
Unit Tests	4m 2s
Integration Tests (ubuntu, 24.04)	3m 7s
Integration Tests (alpine, 3.22)	3m 4s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	12m 46s
Integration Tests (redhatenterprise, 9)	2m 50s
Load Tests	5m 17s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	12m 51s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	12m 55s
Integration Tests - Official OSS Images (bookworm, stable, debian)	12m 35s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	12m 54s
Integration Tests - Official OSS Images (alpine, stable, alpine)	12m 49s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	12m 40s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	12m 39s
	2h 22m 8s

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