Add labels as headers in gRPC connections #5367

Job	Run time
Lint	4m 32s
Unit tests with race condition detection	2m 47s
Unit Tests	2m 25s
Build Unsigned Snapshot	2m 2s
Performance Tests	7m 8s
Integration Tests (redhatenterprise, 9)	8m 50s
Integration Tests (ubuntu, 24.04)	8m 41s
Integration Tests (alpine, 3.22)	7m 6s
Integration Tests - Official OSS Images (bookworm, stable, debian)	7m 54s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	7m 51s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	7m 20s
Integration Tests - Official OSS Images (alpine, stable, alpine)	7m 17s
Load Tests	4m 36s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	7m 42s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	7m 45s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	7m 29s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	7m 53s
	1h 49m 18s

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