Put summarize_diff_quick_action behind license check
What does this MR do and why?
Required for an eventual release
[Readiness Checklist] Summarize proposed change... (#406809 - closed)
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.
Related to #404901 (closed) and #406809 (closed)