Merge branch 'sf/fix/429807-add-keyboard-shortcut-for-compare-view' into 'master'

Add keyboard shortcut for compare button

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/135465



Merged-by: Artur Fedorov <afedorov@gitlab.com>
Approved-by: Jon Glassman <jglassman@gitlab.com>
Approved-by: Diana Zubova <dzubova@gitlab.com>
Approved-by: Artur Fedorov <afedorov@gitlab.com>
Co-authored-by: Jon Glassman <jglassman@gitlab.com>
Co-authored-by: Sam Figueroa <sfigueroa@gitlab.com>