Cloudflare Function error logging to Sentry

[ikesau]

When working on upgrading the donation flow, we temporarily added Sentry logging, but then removed it (See #3177 and #3732)

Now that we're doing more and more things through CF functions, it would be nice to get a better sense of what types of errors are occurring and why, because the CF analytics dashboard isn't very granular.

We should add the Sentry middleware to each route (making sure to check with @bnjmacdonald that this won't eat too much into our session replay budget)