Merge branch...

Merge branch '433291-adjust-styling-of-rich-text-editor-formatting-toolbar-to-match-md-editor-header' into 'master' 

Adjust styling of rich text editor toolbar to match md header

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138382



Merged-by: Illya Klymov <xanf@xanf.me>
Approved-by: Serhii Yarynovskyi <syarynovskyi@gitlab.com>
Approved-by: Illya Klymov <xanf@xanf.me>
Approved-by: Pedro Moreira da Silva <hi@pedroms.com>
Reviewed-by: Pedro Moreira da Silva <hi@pedroms.com>
Reviewed-by: Chad Lavimoniere <clavimoniere@gitlab.com>
Co-authored-by: Chad Lavimoniere <clavimoniere@gitlab.com>