Update in-app ultimate trials eligibility to use new SSOT endpoint

Serhii Yarynovskyirequested to merge
507860-in-app-ultimate-trial-uses-new-ssot into master

What does this MR do and why?

  • Updates the ultimate trial self-service application process to use CDOT endpoint with cache to determine trial eligibility instead of purely database queries locally.
  • Introduces a feature flag to derisk.
  • see #507860 (closed) for details on the why.

MR acceptance checklist

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Related to #507860 (closed)

Edited by Doug Stull

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