[client-app] Don't report incorrect username or password to Sentry

Summary:
This is not a bug. Maaaybe we want to report this to MixPanel for individual
user debugging (how do we do that?), but it doesn't make sense to report this
error to Sentry.

Example:

https://sentry.io/nylas/nylas-mail/issues/230530818/

Test Plan: yolo

Reviewers: mark, juan

Reviewed By: juan

Differential Revision: https://phab.nylas.com/D4130

packages/client-app/src/flux/nylas-api-request.es6

@@ -118,6 +118,7 @@ export default class NylasAPIRequest {
   async _notifyOfAPIError(apiError) {
     const ignorableStatusCodes = [
       0,   // When errors like ETIMEDOUT, ECONNABORTED or ESOCKETTIMEDOUT occur from the client
+      401, // Don't report `Incorrect username or password`
       404, // Don't report not-founds
       408, // Timeout error code
       429, // Too many requests