Cleanup integration tests #4990

Job	Run time
Lint	4m 31s
Unit tests with race condition detection	2m 38s
Unit Tests	2m 22s
Performance Tests	5m 2s
Build Unsigned Snapshot	1m 59s
Load Tests	4m 54s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	1m 41s
Integration Tests - Official OSS Images (bookworm, stable, debian)	1m 41s
Integration Tests (ubuntu, 22.04)	1m 15s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	1m 32s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	1m 28s
Integration Tests (redhatenterprise, 9)	1m 15s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	1m 30s
Integration Tests - Official OSS Images (alpine, stable, alpine)	1m 26s
Integration Tests (alpine, 3.19)	1m 12s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	1m 33s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	1m 36s
Publish NGINX Agent v3 packages	0s
	37m 35s

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