Merge branch '337915-copy-ref-shortcut' into 'master'

Add copy reference keyboard shortcut

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/128542



Merged-by: Alexander Turinske <aturinske@gitlab.com>
Approved-by: Ammar Alakkad <aalakkad@gitlab.com>
Approved-by: Sascha Eggenberger <seggenberger@gitlab.com>
Approved-by: Alexander Turinske <aturinske@gitlab.com>
Reviewed-by: Ammar Alakkad <aalakkad@gitlab.com>
Reviewed-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>
Co-authored-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>