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

• Verify the change in all affected pipelines.

Test run: https://ops.gitlab.net/gitlab-org/quality/staging/-/pipelines/1452025

added maintenancepipelines typemaintenance labels

assigned to @acunskis

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Reviewer	Maintainer
David Dieulivol (@ddieulivol) (UTC+2, 1 hour behind @acunskis)	Mark Lapierre (@mlapierre) (UTC+11, 8 hours ahead of @acunskis)

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Generated by Danger

marked the checklist item Verify the change in all affected pipelines. as completed

changed the description

@mlapierre Would You mind reviewing this small change?

requested review from @mlapierre

added 1 commit

• 9fe3470f - Add ability to override gitlab-qa cache key and qa image

Compare with previous version

resolved all threads

mentioned in commit 4d33e568

merged

mentioned in merge request preprod!41 (merged)

mentioned in merge request release!40 (merged)

mentioned in merge request staging!134 (merged)

mentioned in merge request canary!48 (merged)

mentioned in merge request staging-canary!48 (merged)

mentioned in merge request staging-ref!51 (merged)