Update flag data for Payment APIs; delete PaymentDetailsUpdate dictio…

…nary (#12277)

* Update flag data for PaymentRequest[UpdateEvent]

* Delete PaymentDetailsUpdate dictionary

* Update PaymentMethodChangeEvent and PaymentResponse

* Remove notes

* Remove subfeatures

* Remove non-needed subfeatures

* Add version_removed for Firefox Android

* Apply suggestions from code review

Co-authored-by: Daniel D. Beck <[email protected]>

* Fix indentation

* Apply suggestions from code review

Co-authored-by: Daniel D. Beck <[email protected]>

* Remove notes

* Remove remaining notes

Co-authored-by: Daniel D. Beck <[email protected]>