MM-34271: Skip test TestLoggingAfterInitialized (#17226)

https://mattermost.atlassian.net/browse/MM-34271

```release-note
NONE
```

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

shared/mlog/global_test.go

@@ -28,6 +28,8 @@ func TestLoggingBeforeInitialized(t *testing.T) {
 }
 
 func TestLoggingAfterInitialized(t *testing.T) {
+	t.Skip("Racy test:  MM-34271")
+
 	testCases := []struct {
 		Description         string
 		LoggerConfiguration *mlog.LoggerConfiguration