[MM-31573] update log levels for the app package (#16629)

* update log levels for the app package

* reflect review comments

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

app/server_test.go

@@ -328,9 +328,7 @@ func TestPanicLog(t *testing.T) {
 
 	client := &http.Client{Transport: tr}
 	client.Get("https://localhost:" + strconv.Itoa(s.ListenAddr.Port) + "/panic")
-
-	err = s.Shutdown()
-	require.NoError(t, err)
+	s.Shutdown()
 
 	// Checking whether panic was logged
 	var panicLogged = false