Merge branch 'pipeline-minigraph-dropdown-migration' into 'master'

Pipeline MiniGraph: Migrate dropdown to GlDisclosureDropdown

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/142427



Merged-by: Himanshu Kapoor <info@fleon.org>
Approved-by: Paul W <19602001-paintedbicycle-gitlab@users.noreply.gitlab.com>
Approved-by: Jay Montal <jmontal@gitlab.com>
Approved-by: Himanshu Kapoor <info@fleon.org>
Reviewed-by: Sascha Eggenberger <seggenberger@gitlab.com>
Co-authored-by: Sascha Eggenberger <seggenberger@gitlab.com>
Co-authored-by: Phil Hughes <me@iamphill.com>