Merge branch '409691-pajamas-migration-projects_dropdown_filter' into 'master'

Migrate legacy GlDropdown in projects_dropdown_filter

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/121067



Merged-by: Alexander Turinske <aturinske@gitlab.com>
Approved-by: Ross Byrne <robyrne@gitlab.com>
Approved-by: Alexander Turinske <aturinske@gitlab.com>
Approved-by: Matthew Nearents <mnearents@gitlab.com>
Reviewed-by: Alexander Turinske <aturinske@gitlab.com>
Co-authored-by: Artur Fedorov <afedorov@gitlab.com>