Add header_setter extension for OTel collector #4210

Job	Run time
Performance Tests	5m 31s
Unit tests with race condition detection	2m 54s
Lint	5m 11s
Build Unsigned Snapshot	2m 30s
Unit Tests	2m 43s
Integration Tests - Official OSS Images (bookworm, stable, debian)	4m 37s
Load Tests	5m 15s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	4m 27s
Integration Tests (ubuntu, 22.04)	6m 7s
Integration Tests - Official OSS Images (alpine, stable, alpine)	4m 11s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	4m 25s
Integration Tests (redhatenterprise, 9)	5m 46s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	4m 15s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	4m 10s
Integration Tests (alpine, 3.19)	4m 43s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	4m 30s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	4m 16s
Publish NGINX Agent v3 packages	0s
	1h 15m 31s

Provide feedback