GitLab Project Review App Usefulness Improvement Iteration
## Objective
Increasing the usefulness and availability of Review Apps for the `gitlab-org/gitlab` project by providing an on demand environment for MRs that is fit for testing
### Success criteria
Enable signoff of frontend changes for Product Designers using Review Apps within ~"devops::create" to accomplish https://gitlab.com/gitlab-org/gitlab/-/issues/30140 and working towards achieving signoff as apart of definition of done https://gitlab.com/gitlab-com/www-gitlab-com/-/issues/12302
### Prioritized Blockers
- Understand and resolve the Review App availability blockers
- Reduced default data significantly reduces usefulness
- Clearer mechanism for deploying and making Review Apps available for merge requests
#### Subsequent challenges
- Enable easier feature toggle
- Add visual review feature in support of Product Designer signoff: https://docs.gitlab.com/ee/ci/review_apps/#configure-review-apps-for-visual-reviews
- Accelerate time to deploy (currently 27 minutes for `review-build-cng` and `review-deploy`)
- Deploy from known unblocked state to work around issues like https://gitlab.com/gitlab-org/gitlab/-/issues/338361
epic