Add unmanaged option to file proto #4520

Job	Run time
Unit tests with race condition detection	2m 27s
Build Unsigned Snapshot	1m 53s
Lint	4m 1s
Performance Tests	4m 36s
Unit Tests	2m 0s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	4m 54s
Integration Tests (ubuntu, 22.04)	8m 30s
Load Tests	4m 26s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	5m 4s
Integration Tests (redhatenterprise, 9)	7m 52s
Integration Tests - Official OSS Images (bookworm, stable, debian)	5m 6s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	5m 4s
Integration Tests (alpine, 3.19)	5m 35s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	5m 10s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	4m 58s
Integration Tests - Official OSS Images (alpine, stable, alpine)	4m 58s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	4m 44s
Publish NGINX Agent v3 packages	0s
	1h 21m 18s

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