Merge branch...

Merge branch '496555-replace-btn-transparent-class-with-util-classes-in-app-assets-javascripts-work_items' into 'master' 

Replace btn-transparent with equivalent util classes

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167736



Merged-by: Enrique Alcántara <ealcantara@gitlab.com>
Approved-by: Ammar Alakkad <aalakkad@gitlab.com>
Approved-by: Enrique Alcántara <ealcantara@gitlab.com>
Co-authored-by: James Rushford <jrushford@gitlab.com>