CI: Use gcr mirror in DinD (17.10 Backport)

What does this MR do?

Backport !2292 (merged) to 17-10-stable to pull images through the GCR mirror for stable branch and tag pipelines.

Related issues

https://gitlab.com/gitlab-org/distribution/team-tasks/-/issues/1720

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• When ready for review, MR is labeled "~workflow::ready for review" per the Distribution MR workflow

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Integration tests added to GitLab QA
• The impact any change in container size has should be evaluated
• New dependencies are managed with GitLab forked renovatebot