[Housekeeping] Improve test stability (#232)

* Ensured all tests use at least the DataCase module

* addressed one flakey test

* More flakey tests

* Consolidated Mox usage

test/pinchflat_web/controllers/settings/apprise_server_live_test.exs

@@ -1,13 +1,10 @@
 defmodule PinchflatWeb.Settings.AppriseServerLiveTest do
   use PinchflatWeb.ConnCase
 
-  import Mox
   import Phoenix.LiveViewTest
 
   alias Pinchflat.Settings.AppriseServerLive
 
-  setup :verify_on_exit!
-
   describe "initial rendering" do
     test "renders the input", %{conn: conn} do
       {:ok, _view, html} = live_isolated(conn, AppriseServerLive, session: create_session(""))