Remove GOPROXY from release branch workflow #4828

Job	Run time
Build Unsigned Snapshot	2m 37s
Unit tests with race condition detection	2m 30s
Lint	4m 19s
Performance Tests	4m 46s
Unit Tests	2m 13s
Load Tests	4m 32s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	6m 5s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	5m 55s
Integration Tests - Official OSS Images (bookworm, stable, debian)	6m 9s
Integration Tests (ubuntu, 22.04)	9m 44s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	6m 22s
Integration Tests (redhatenterprise, 9)	8m 18s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	6m 7s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	6m 11s
Integration Tests - Official OSS Images (alpine, stable, alpine)	5m 59s
Integration Tests (alpine, 3.19)	6m 39s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	6m 0s
Publish NGINX Agent v3 packages	0s
	1h 34m 26s

Provide feedback