Merge branch '28470-snippets-tooltip' into 'master'

Add tooltip to snippet visibility icon

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/147295



Merged-by: Miguel Rincon <mrincon@gitlab.com>
Approved-by: Chad Lavimoniere <clavimoniere@gitlab.com>
Approved-by: Nataliia Radina <nradina@gitlab.com>
Approved-by: Miguel Rincon <mrincon@gitlab.com>
Co-authored-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>