Prompt to reset the Meetup API authentication tokens, as we can't do it automatically.

[dd32]

At some point in the past while debugging a Meetup API issue, I was forced to change how the authentication reset process works, I'm unsure what the issue was, but it likely pre-dated the files being canonicalised here.

Recently (likely after the meetup.com password was changed) the events api ceased to import meetup events, throwing the following warning:

E_USER_WARNING:
   Official_WordPress_Events::handle_error_response error for [make.wordpress.org](http://make.wordpress.org/):
   HTTP Code: 400 Message: Bad Request
   Body: {"error_description":"Unknown or previously used refresh_token","error":"invalid_grant"}

It seems like running the request with these changes, and re-authenticating the oAuth applications has restored the meetup.com ingestion.

The changes in this PR have been sitting in my development environment since ~May 2022, so I don't recall the exact reasoning behind it, other than it was likely to resolve this same error.
It looks like the main thing is that it attempts to check the refresh_token is valid and errors out if not, where as currently it seems to assume that the refresh_token will never be invalid. I think.

This is a PR for now as I wanted to get the code off my hands and somewhere for others; I haven't fully tested and reviewed these changes to verify it does exactly what I think it does