Merge branch 'add-get_access_request-route' into 'master'

Support linking to access requests

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138336



Merged-by: Lee Tickett <ltickett@gitlab.com>
Approved-by: Jay Montal <jmontal@gitlab.com>
Approved-by: Rohit Shambhuni <rshambhuni@gitlab.com>
Approved-by: Felipe Artur <fcardozo@gitlab.com>
Reviewed-by: Christina Lohr <clohr@gitlab.com>