Add update fork button
What does this MR do and why?
Adds possibility to update fork (pull changes from the source)
Screenshots or screen recordings
Screen_Recording_2023-03-14_at_19.54.56
How to set up and validate locally
1.Enable :synchronize_fork FF
echo "Feature.enable(:synchronize_fork)" | gdk rails c
2. Go to any project which is forked and diverged from upstream or create one
3. Observe Update fork button and try clicking
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 #330243 (closed)