Migrate table cell dropdown to a bubble menu

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/182909



Merged-by: Enrique Alcántara <ealcantara@gitlab.com>
Approved-by: Chad Lavimoniere <clavimoniere@gitlab.com>
Approved-by: Enrique Alcántara <ealcantara@gitlab.com>
Co-authored-by: Himanshu Kapoor <hkapoor@gitlab.com>