Migrate trigger cluster reindexing button
What does this MR do and why?
Migrates the "Trigger cluster reindexing" button to use the confirm
variant (no visual change, so only including the after screenshot).
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.