Add ability to override gitlab-qa cache key and qa image
What does this MR do?
Adds ability to override gitlab-qa-cache key and qa image
Related to: gitlab-org/quality/quality-engineering/team-tasks#1471 (closed)
Check-list
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Verify the change in all affected pipelines.
Test run: https://ops.gitlab.net/gitlab-org/quality/staging/-/pipelines/1452025
Edited by Andrejs Cunskis