Add docs for resolvable issue threads
What does this MR do and why?
Extract common section to discussions page and leave the MR specific ones in the MR page
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 #31114 (closed)
Edited by Heinrich Lee Yu