Update GITLAB_HELM_CHART_REF to v5.10.2 for review app
What does this MR do and why?
See #361833 (comment 940739730)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.