Improve error tracking error handling

Dmytro Zaporozhets (DZ)requested to merge
dz-error-tracking-handle-invalid-payload into master

What does this MR do and why?

Make sure we handle invalid payload for error tracking correctly:

  • Return 400 when activerecord is invalid
  • Validate payload and return 400 error if invalid

Fixes #344652 (closed), #344651 (closed), #344653 (closed)

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