Base final image on ubi micro instead of minimal

What does this MR do?

Base final image on ubi micro instead of minimal

Changelog: changed

This will:

• reduce the final image size
• reduce CVE noise from the base image

Impact on (compressed) image size is ~26Mi:

$ skopeo inspect docker://registry.gitlab.com/gitlab-org/cloud-native/gitlab-operator:cb-ubi-micro \
  | jq '.LayersData | [ .[].Size ] | add' \
  | numfmt --to=iec-i
45Mi
$ skopeo inspect docker://registry.gitlab.com/gitlab-org/cloud-native/gitlab-operator:latest \
  | jq '.LayersData | [ .[].Size ] | add' \
  | numfmt --to=iec-i
71Mi

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
• Tests added
• Integration tests added to GitLab QA
• Equivalent MR/issue for omnibus-gitlab opened
• Validate potential values for new configuration settings. Formats such as integer 10, duration 10s, URI scheme://user:passwd@host:port may require quotation or other special handling when rendered in a template and written to a configuration file.

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