ee-specific-lines-check and ee-files-location-check fail if CE branch is in fork yet EE branch is in gitlab-org

See for example https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/152204927 in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9317:

⚠️ We did not find a branch that would match the current 'refactor/56369-extract-jump-to-next-discussion-button-ee' branch in the https://gitlab-ci-token:xxxxxxxxxxxxxxxxxxxx@gitlab.com/gitlab-org/gitlab-ce.git repository. We will fetch 'master' instead. ℹ️ If you have a CE branch for the current branch, make sure that its name includes 'refactor/56369-extract-jump-to-next-discussion-button'.

The corresponding CE merge request https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9317 was created from a fork.