Plans: Debug button to force refresh of paid status

If, after purchasing a plan, that change has not made it to the local site, having a button to query the API on the debugger page would provide a step HEs can suggest to folks in this situation.

Start at the debugger page and trace how the local site currently determines paid status and communicates with the API. Done means the page offers a way to query the API again after a purchase so the local paid status can be refreshed.

Written by the indexing model from the issue text.