Add parallel to release-environments-qa

What does this MR do and why?

Add parallel to release-environments-qa

Smoke tests were parallelized, so we need to use the parallel feature of GitLab CI to run the job faster.

This is done as a suggestion from the Test Platform team (cc @svistas ). You can read the original discussion on the internal Slack.

Close gitlab-com/gl-infra/delivery#20240 (closed)

Close gitlab-org/quality/quality-engineering/team-tasks#2545 (closed)

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