feat: call SIGNED_OUT event if token refresh fails (#815)

If token refresh fails, such as when the user has logged out from other
places, or their session has been terminated, the `SIGNED_OUT` event
should be fired and the session should be removed from storage.

src/GoTrueClient.ts

@@ -1753,6 +1753,11 @@ export default class GoTrueClient {
       if (isAuthError(error)) {
         const result = { session: null, error }
 
+        if (!isAuthRetryableFetchError(error)) {
+          await this._removeSession()
+          await this._notifyAllSubscribers('SIGNED_OUT', null)
+        }
+
         this.refreshingDeferred?.resolve(result)
 
         return result