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

```release-note
NONE
```

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

server/channels/app/import_test.go

@@ -53,6 +53,8 @@ func checkNoError(t *testing.T, err *model.AppError) {
 }
 
 func AssertAllPostsCount(t *testing.T, a *App, initialCount int64, change int64, teamName string) {
+	t.Helper()
+	require.NoError(t, a.Srv().Store().Post().RefreshPostStats())
 	result, err := a.Srv().Store().Post().AnalyticsPostCount(&model.PostCountOptions{TeamId: teamName})
 	require.NoError(t, err)
 	require.Equal(t, initialCount+change, result, "Did not find the expected number of posts.")