[AI assisted]: Improve system console statistics performance (#29899)

```release-note
NONE
```

Co-authored-by: Matthew Birtch <mattbirtch@gmail.com>

server/channels/api4/user_test.go

@@ -2649,6 +2649,7 @@ func TestPermanentDeleteAllUsers(t *testing.T) {
 		require.NoError(t, err)
 		require.Greater(t, len(users), 0)
 
+		require.NoError(t, th.App.Srv().Store().Post().RefreshPostStats())
 		postCount, err := th.App.Srv().Store().Post().AnalyticsPostCount(&model.PostCountOptions{})
 		require.NoError(t, err)
 		require.Greater(t, postCount, int64(0))
@@ -2662,6 +2663,7 @@ func TestPermanentDeleteAllUsers(t *testing.T) {
 		require.NoError(t, err)
 		require.Len(t, users, 0)
 
+		require.NoError(t, th.App.Srv().Store().Post().RefreshPostStats())
 		postCount, err = th.App.Srv().Store().Post().AnalyticsPostCount(&model.PostCountOptions{})
 		require.NoError(t, err)
 		require.Equal(t, postCount, int64(0))