DEV: Set owner on raw views (#9624)

This allows things like `Ember.inject.service` to be used within the raw view. setOwner simply sets one property on the object, and the result is cached along with the other injected properties, so this should have negligible performance impact.

app/assets/javascripts/discourse/app/helpers/raw.js

@@ -1,6 +1,7 @@
 import { registerUnbound } from "discourse-common/lib/helpers";
 import { findRawTemplate } from "discourse/lib/raw-templates";
 import { htmlSafe } from "@ember/template";
+import { setOwner } from "@ember/application";
 
 let _injections;
 
@@ -16,6 +17,7 @@ function renderRaw(ctx, container, template, templateName, params) {
       session: container.lookup("session:main"),
       topicTrackingState: container.lookup("topic-tracking-state:main")
     };
+    setOwner(_injections, container);
   }
 
   if (!params.view) {