Add agent config option to set NGINX API URL #6610

Job	Run time
Build Grafana Dashboard Example	1m 33s
Component Tests	1m 8s
Build signed snapshot	8m 19s
Unit Tests	3m 42s
Performance Tests	7m 19s
Lint	1m 0s
Build unsigned snapshot	4m 36s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	45s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	52s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	55s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	3m 27s
Integration Tests - Official OSS Images (bookworm, stable, debian)	3m 28s
Integration Tests - Official OSS Images (alpine, stable, alpine)	3m 37s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	3m 34s
Integration Tests (amazonlinux, 2)	5m 2s
Integration Tests (almalinux, 9)	4m 32s
Integration Tests (rockylinux, 9)	4m 36s
Integration Tests (rockylinux, 8)	6m 33s
Integration Tests (almalinux, 8)	5m 12s
Integration Tests (amazonlinux, 2023)	5m 3s
Integration Tests (oraclelinux, 8)	5m 57s
Integration Tests (alpine, 3.22)	3m 42s
Integration Tests (oraclelinux, 9)	5m 20s
Integration Tests (ubuntu, 24.04)	4m 11s
Integration Tests (alpine, 3.21)	3m 54s
Integration Tests (alpine, 3.20)	3m 57s
Integration Tests (alpine, 3.23)	3m 45s
Integration Tests (debian, bullseye-slim)	4m 48s
Integration Tests (debian, bookworm-slim)	4m 24s
	1h 55m 11s

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