Update error messaging on error tracking page
Currently, if a user tries to save changes when configuring the error tracking settings but they haven't yet completed all of the required fields, they get the following error message:
We should try to clean up the messaging around this error. Perhaps something like this could work? "There was an error saving your changes. Sentry API URL and Auth Token are required fields." Alternately, having a listed version of the fields as suggested in the original MR would work, too!