Added Agent version to userAgent #4817

Job	Run time
Lint	4m 3s
Performance Tests	4m 42s
Build Unsigned Snapshot	1m 53s
Unit tests with race condition detection	2m 35s
Unit Tests	2m 2s
Load Tests	4m 25s
Integration Tests (ubuntu, 22.04)	8m 51s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	5m 58s
Integration Tests (redhatenterprise, 9)	8m 42s
Integration Tests - Official OSS Images (bookworm, stable, debian)	6m 22s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	6m 12s
Integration Tests (alpine, 3.19)	6m 33s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	6m 15s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	6m 7s
Integration Tests - Official OSS Images (alpine, stable, alpine)	5m 59s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	6m 4s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	6m 4s
Publish NGINX Agent v3 packages	0s
	1h 32m 47s

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