Fix AutoDevOps QA test

What does this MR do?

• Refactor test to prefer let over instance variables
• Prefer to create project via API over Browser UI
• Create Project with autodevops enabled
• Use new quarantine process
• Use same project creation fabrication for each example
• Make disable_optional_jobs private and invoke before each example (including before smoke to prevent unneeded processing)

Closes #118481 (closed)
Closes #196742 (closed)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content