Stop reporting 'Failed to fetch' errors

Summary: Failed to fetch promise rejections should not be reported

Reviewed By: passy

Differential Revision: D31266851

fbshipit-source-id: ce3c15db5504c01d66b44e032c2b7fb752ec2ec3

desktop/app/src/utils/errors.tsx

@@ -20,7 +20,11 @@ export function isAuthError(
 export function isConnectivityOrAuthError(
   err: any,
 ): err is ConnectivityError | UserNotSignedInError | UserUnauthorizedError {
-  return err instanceof ConnectivityError || isAuthError(err);
+  return (
+    err instanceof ConnectivityError ||
+    isAuthError(err) ||
+    String(err).startsWith('Failed to fetch')
+  );
 }
 
 export class CancelledPromiseError extends Error {