Add copy labels button
What does this MR do and why?
This MR adds a copy button to the labels section in the issues and epics sidebar. The copy is a quick action containing all the labels attached to an issuable.
Related to Extend `copy_metadata` to select what to copy (#426380).
Screenshots or screen recordings
Screen_Recording_2023-09-28_at_04.38.28
How to set up and validate locally
- Open any issue
- Assign any labels
- Click the copy button
- Paste the copy into any textfield to verify the labels are copied correctly
Edited by Stanislav Lashmanov