Stabilize merge request creation

What does this MR do?

Related Issue: https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/980

The merge request being created is failing because the project it's attempting to create is not being created causing a ResourceNotFoundError when attempting to reference the project (https://ops.gitlab.net/gitlab-org/quality/staging/-/jobs/4630539). This MR switches to using #fabricate_via_api! when creating a new project so there's a fallback when a ResourceNotFoundError occurs.

Does this MR meet the acceptance criteria?

Conformity

• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.