fix: Only run advanced SAST job when Ultimate license present

What does this MR do and why?

Only run advanced SAST job when Ultimate license present. While we do perform a license check in the job itself we should limit how often the job executes so users on a non-Ultimate license don't see a failing job in their pipelines

Relates to #472217 (closed) and also addresses #471878 (closed)

Note that this cleans up some of the specs to use shared examples so reviewing per-commit is a bit easier

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