Fix race condition in telemetry (#18734)

* Fix race condition in telemetry

* Fix tests

app/app_test.go

@@ -50,7 +50,6 @@ func TestUnitUpdateConfig(t *testing.T) {
 	mockSystemStore.On("GetByName", "UpgradedFromTE").Return(&model.System{Name: "UpgradedFromTE", Value: "false"}, nil)
 	mockSystemStore.On("GetByName", "InstallationDate").Return(&model.System{Name: "InstallationDate", Value: "10"}, nil)
 	mockSystemStore.On("GetByName", "FirstServerRunTimestamp").Return(&model.System{Name: "FirstServerRunTimestamp", Value: "10"}, nil)
-	mockSystemStore.On("Get").Return(make(model.StringMap), nil)
 	mockLicenseStore := mocks.LicenseStore{}
 	mockLicenseStore.On("Get", "").Return(&model.LicenseRecord{}, nil)
 	mockStore.On("User").Return(&mockUserStore)