MM-10658 Change config fields to pointers (#9033)

* MM 10658 Change config fields to pointers (#8898)

* Change fields of config structs to pointers and set defaults

MM-10658 https://github.com/mattermost/mattermost-server/issues/8841

* Fix tests that go broken during switching config structs to pointers

MM-10658 https://github.com/mattermost/mattermost-server/issues/8841

* Apply changes of current master while switching config structs to pointers

MM-10658 https://github.com/mattermost/mattermost-server/issues/8841

* Fix new config pointer uses

* Fix app tests

* Fix mail test

* remove debugging statement

* fix TestUpdateConfig

* assign config consistently

* initialize AmazonS3Region in TestS3TestConnection

* initialize fields for TestEmailTest

* fix TestCheckMandatoryS3Fields

web/webhook.go

@@ -56,7 +56,7 @@ func incomingWebhook(c *Context, w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	if c.App.Config().LogSettings.EnableWebhookDebugging {
+	if *c.App.Config().LogSettings.EnableWebhookDebugging {
 		mlog.Debug(fmt.Sprintf("Incoming webhook received. Id=%s Content=%s", id, incomingWebhookPayload.ToJson()))
 	}