Merge branch 'feat/use-pwa-icon-as-apple-touch-icon-if-defined' into 'master'

Use Progressive Web App (PWA) icon as apple-touch-icon if defined

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/147551



Merged-by: Paul Slaughter <pslaughter@gitlab.com>
Approved-by: Bob Van Landuyt <bob@gitlab.com>
Approved-by: Doug Stull <dstull@gitlab.com>
Approved-by: Paul Slaughter <pslaughter@gitlab.com>
Reviewed-by: Roger Meier <r.meier@siemens.com>
Reviewed-by: Bob Van Landuyt <bob@gitlab.com>
Reviewed-by: Doug Stull <dstull@gitlab.com>
Co-authored-by: Roger Meier <r.meier@siemens.com>