[MM-53026] - Disabled insights by default (#23702)

* Insights disabled by default

* fixed tests

* fixed tests

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/user_test.go

@@ -1808,6 +1808,10 @@ func TestCreateUserWithInitialPreferences(t *testing.T) {
 	defer th.TearDown()
 
 	t.Run("successfully create a user with initial tutorial and recommended steps preferences", func(t *testing.T) {
+		th.ConfigStore.SetReadOnlyFF(false)
+		defer th.ConfigStore.SetReadOnlyFF(true)
+		th.App.UpdateConfig(func(cfg *model.Config) { cfg.FeatureFlags.InsightsEnabled = true })
+
 		testUser := th.CreateUser()
 		defer th.App.PermanentDeleteUser(th.Context, testUser)