Send a alert to Sentry when `/api` sends an error response

[julieg18]

• Sentry gives us a way to do this with @sentry/gatsby(docs)
• We could update src/utils/front/api.ts, sending a Sentry alert after every setError call. There may be more elegant ways of handling this though.

[yathomasi]

We can directly log from the API themselves using @sentry/node