Epic: MVP: Pre-launch Tasks for Payment Activity widget

[shendy-a8c]

This issue encapsulates the pre-launch tasks for the Payment Activity Widget/Card coming in WooPayments 7.9.

Tasks

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1. https://github.com/Automattic/tracks-events-registration/issues/2466
2. [Task] Remove feature flag before 7.9 so that payment activity card becomes available to all merchants in 7.9.0 #8953
   category: projects component: reporting focus: reporting +3
3. [Task] Update public REST API docs to include the /reporting/payment_activity endpoint #9011
   Documentation category: projects focus: reporting +3
4. Demo pdjTHR-3N2-p2
5. Address feedback from demo
6. Review issues in project backlog that may need resolving prior to launch
7. Ensure public documentation is updated
8. Consider removing test payment activity survey response data that exists in the prod WPCOM database which may pollute data analysis – may be unnecessary since survey responses can be filtered by launch date.

Notes

Survey Test Data removal

Survey for Payment Activity already has some data from testing. See #8506 (comment).

As @Jinksi said #8506 (comment), we could clean up the DB to get rid of those testing data before launch.

This may be unnecessary since survey responses can be filtered by launch date +