Integrations override table: Don't show empty state when error occurs

The following discussion from !66995 (merged) should be addressed (related to #218252 (closed)):

• @pslaughter started a discussion:

  issue (non-blocking): If there's an error fetching the first page of projects we show the "empty-text" which is a bit misleading.

  

  Ideally we would just show the user that something went wrong and enable them a way to refresh. Could/should we create a follow-up for this? 😄

Possible approaches:

• Use a gl-alert, placed under the tabs, and hide the table altogether.