Remove diff summary from merge requests
What does this MR do and why?
Removes the diff summary notes toggle from the merge requests action menu.
Partially resolves #443331 (closed)
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
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Numbered steps to set up and validate the change are strongly suggested.
Edited by Kai Armstrong