Moved changes from https://gitlab.com/gitlab-org/gitlab/-/merge_requests/60611
Added fetching merge request permisstion

Separated user search queries

Fixed canMerge calculation

Removed default debounce

Added correct canMerge calculation

Fixed assignees canMerge

Fixed "cannot merge" icon positioning

Frxed missing import error

Fixed MR assignees spec for disabled FF

Added tests for FF enabled

Fixed user select spec

Added merge permissions to active user

Added tooltips for cannot merge

Fixed invite user test case

Fixed MR assignees spec

Fixed sidebar assignees spec

Removed non-required changes

Revert "Removed non-required changes"

This reverts commit b4cb5b8a38e922f3dec95e55e0f656408b94c87a.
Fixed rubocop warning

Fixed multiple assignees specs for FF disabled

Fixed multiple assignees for FF enabled

Added unit test for sidebar participant

Added tests for user select
Added @ to usernames on sidebar

Added focusing search input

Fixed dropdown navigation

Fixed selecting assignees

Fixed tooltip for collapsed assignees

Removed opening dropdown on collapsed click

Fixed assignees widget scoped slot

Removed unnecessary paddings

Fixed sidebar assignees widget test

Fixed user select spec