Add labels as headers in gRPC connections #5416

Job	Run time
Unit Tests	2m 26s
Lint	4m 47s
Build Unsigned Snapshot	2m 3s
Unit tests with race condition detection	2m 45s
Performance Tests	7m 4s
Integration Tests (ubuntu, 24.04)	8m 47s
Load Tests	5m 4s
Integration Tests - Official OSS Images (bookworm, stable, debian)	7m 29s
Integration Tests (redhatenterprise, 9)	8m 56s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	7m 53s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	7m 47s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	7m 53s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	8m 5s
Integration Tests - Official OSS Images (alpine, stable, alpine)	7m 31s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	7m 45s
Integration Tests (alpine, 3.22)	7m 24s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	7m 41s
	1h 51m 20s

Provide feedback