Backport chart publishing verification and CI_TOOLS_VERSION bump to 9-10-stable

What does this MR do?

This is a backport of !4934 (merged) and !4988 (merged) to 9-10-stable, so that chart publishing verification and the required CI tools version work for the 18.10 release line.

Cherry-picked commits:

  • c9b7d3b6 feat: verify charts publishing pipeline in charts/charts.gitlab.io (!4934 (merged))
  • f042c5a6 Bump CI_TOOLS_VERSION from 4.22.0 to 5.53.0 (!4988 (merged))

Author checklist

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Required

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

  • Merge Request Title and Description are up to date, accurate, and descriptive.
  • MR targeting the appropriate branch.
  • MR has a green pipeline.
  • Documentation created/updated. N/A - CI config change only.
  • Tests added/updated, and test plan for scenarios not covered by automated tests. N/A - verified by pipeline.
  • Equivalent MR/issue for omnibus-gitlab opened. N/A - backport of existing changes.

Reviewers checklist

Edited by Manjunath Bhadrannavar

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