Merge branch '439398-create-branch-rules-status-check-gql' into 'master'

Make GraphQL mutation ExternalStatusCheckCreate

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/147471



Merged-by: Jan Provaznik <jprovaznik@gitlab.com>
Approved-by: Jay Montal <jmontal@gitlab.com>
Approved-by: Jan Provaznik <jprovaznik@gitlab.com>
Reviewed-by: Jan Provaznik <jprovaznik@gitlab.com>
Reviewed-by: Jay Montal <jmontal@gitlab.com>
Reviewed-by: Patrick Cyiza <jpcyiza@gitlab.com>
Co-authored-by: Patrick Cyiza <jpcyiza@gitlab.com>
Co-authored-by: Joe Woodward <jwoodward@gitlab.com>