Experiment: Code quality walkthrough [RUN ALL RSPEC] [RUN AS-IF-FOSS]

What does this MR do?

Issue: https://gitlab.com/gitlab-org/growth/engineering/-/issues/5436

This is an experiment to test whether a code quality walkthrough drives CI usage.

How to test locally

• Checkout branch
  • git fetch origin code-quality-walkthrough
  • git checkout code-quality-walkthrough
• echo 'Feature.enable(:code_quality_walkthrough)' | bin/rails c
• Create or go to an empty project
• Disable "Default to Auto DevOps pipeline" in the CI/CD settings of the project (http://localhost:3000/<group_name>/<project_name>/-/settings/ci_cd
• Go to CI/CD -> Pipelines (http://localhost:3000/<group_name>/<project_name>/-/pipelines)

Screenshots

Step 1

control	candidate

Step 2

Step 3

Step 4

success	failed

Step 4

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
  • I have not included a changelog entry because it is behind the feature flag code_quality_walkthrough.