Remove UsersSelect JS from projects/boards
What does this MR do and why?
Since all JS for selecting Assignees for project/boards has been moved to Vue, the JS init UsersSelect is no longer needed.
Similar to work done in previous MR !108113 (merged) for group/boards.
Screenshots or screen recordings
How to set up and validate locally
- Go to Project > Issues > Boards. For example,
http://127.0.0.1:3000/gitlab-org/gitlab-shell/-/boards. - Select any issue in the list.
- Make sure Assignees in the sidebar works as expected.
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 #369995 (closed)