Draft: feat: improve project dropdown validation UX

Vanessa Ottorequested to merge
workloads/de16a431b5c into master

Relates to issue #569660 (closed)

This MR was created by Duo in Session 1116894

Changes

  • Replace alert-based validation with GlFormGroup state validation
  • Add visual feedback to form project dropdown component
  • Improve user experience with inline validation states
  • Implement proper form validation patterns following GitLab UI guidelines

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