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Ensure only one release environment deployment at a time

Mawreen Dela Cruz requested to merge ensure-only-one-release-environment-deployment-at-a-time into master

What does this MR do and why?

To prevent simultaneous execution of deploy and qa jobs in a release environment, the deploy and qa jobs triggered by the first pipeline will take precedence. Meanwhile, the deploy and qa jobs of subsequent pipelines will remain Waiting until the corresponding jobs in the first pipeline are completed.

Related Issue: gitlab-com/gl-infra/delivery#20008 (comment 1896145520)

Note: The previous MR was reverted since the keyword before_script is unknown for trigger jobs. I moved the GitLab API call to edit the resource_group to the after_script of release-environments-deploy-env instead (since this job is run in preparation for the actual deploy job).

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