* allow using Stats API and Props for free_10k subscriptions

* return v3 plans for legacy trials

* do not display grandfathering notice for legacy trials

* set a more accurate BT release date

* fix bug on dev env

Allow the `find/1` function to find sandbox plans

* add error handling and tests for change_plan_preview

* fix feature warning bug

* fix credo warnings

* fix tests

* set BT release date further into the future

* rename function and some vars

* bugfix with limit exceeding

* fix test