feat: GONRG-3981 common pipeline for gcp code, with nested extends, and...

feat: GONRG-3981 common pipeline for gcp code, with nested extends, and before_script for changes in specific service, variables moved to jobs
7 jobs for !292 with feature/GONRG-3981 in 16 minutes and 17 seconds (queued for 4 seconds)
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