Disable Review App related jobs for the security fork

What does this MR do?

This disable Review App related jobs for the security fork, as explained in https://gitlab.com/gitlab-org/gitlab/issues/195800.

Does this MR meet the acceptance criteria?

Conformity

• Code review guidelines
• Merge request performance guidelines
• Style guides
• Separation of EE specific content

Availability and Testing

The Review App related jobs are not present in https://gitlab.com/gitlab-org/security/gitlab/pipelines/107781005 (https://gitlab.com/gitlab-org/security/gitlab/merge_requests/78/pipelines) (except for manual:review-cleanup since it doesn't use rules yet and it's a manual job).

Closes #195800.