Add duo pro trial addon qualifications
What does this MR do and why?
Add duo pro trial addon qualifications
- we want to lock down what namespaces can apply for a duo pro
trial.
- qualifications - has to be a non-free plan and not used duo pro on that namespace before
- db query analysis: !147609 (comment 1828124215)
MR acceptance checklist
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Related to #448506
Edited by Doug Stull