Enhance invite members footer in assignee/reviewer dropdowns

Roy Liurequested to merge
duo/feature/583624-invite-members-dropdown-ux-2927283 into master

Changes

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/583624

This MR enhances the invite members footer in assignee and reviewer dropdowns to make it more noticeable and provide better context for inviting team members.

Screenshots

Before After
Issue assignee Screenshot_2026-02-23_at_3.45.36_PM issue_assignee
Merge Request assignee Screenshot_2026-02-23_at_3.45.10_PM mr_assignee
Merge Request reviewer Screenshot_2026-02-23_at_3.45.18_PM mr_reviewer

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Edited by Roy Liu

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