Merge branch '430786-ci-var-commit-ref-name' into 'master'

Add project ref name in pipeline variables service

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/155868



Merged-by: Rajendra Kadam <rkadam@gitlab.com>
Approved-by: Furkan Ayhan <furkanayhn@gmail.com>
Approved-by: Siddharth Dungarwal <sdungarwal@gitlab.com>
Reviewed-by: Furkan Ayhan <furkanayhn@gmail.com>
Reviewed-by: Rajendra Kadam <rkadam@gitlab.com>