DEV: Convert discourse-hbr to a regular package (#26562)

No need for this to be an ember addon. All we do is import `discourse-hbr/raw-handlebars-compiler` in a node environment.

app/assets/javascripts/discourse-hbr/ember-cli-build.js

@@ -1,13 +0,0 @@
-"use strict";
-
-const EmberAddon = require("ember-cli/lib/broccoli/ember-addon");
-
-module.exports = function (defaults) {
-  const app = new EmberAddon(defaults, {
-    autoImport: {
-      publicAssetURL: "",
-    },
-  });
-
-  return app.toTree();
-};

app/assets/javascripts/discourse-hbr/index.js

@@ -1,5 +0,0 @@
-"use strict";
-
-module.exports = {
-  name: require("./package").name,
-};

app/assets/javascripts/discourse-hbr/package.json

@@ -4,45 +4,15 @@
   "description": "Support for Discourse's raw Handlebars templates (hbr)",
   "author": "Discourse",
   "license": "GPL-2.0-only",
-  "keywords": [
-    "ember-addon"
-  ],
-  "scripts": {
-    "build": "ember build",
-    "lint:hbs": "ember-template-lint .",
-    "lint:js": "eslint .",
-    "start": "ember serve"
-  },
   "dependencies": {
-    "@babel/core": "^7.24.4",
-    "ember-auto-import": "^2.7.2",
-    "ember-cli-babel": "^8.2.0",
-    "ember-cli-htmlbars": "^6.3.0",
     "handlebars": "^4.7.8"
   },
-  "devDependencies": {
-    "@ember/optional-features": "^2.1.0",
-    "@embroider/test-setup": "^3.0.3",
-    "@glimmer/component": "^1.1.2",
-    "broccoli-asset-rev": "^3.0.0",
-    "ember-cli": "~5.7.0",
-    "ember-cli-inject-live-reload": "^2.1.0",
-    "ember-cli-sri": "^2.1.1",
-    "ember-cli-terser": "^4.0.2",
-    "ember-disable-prototype-extensions": "^1.1.3",
-    "ember-load-initializers": "^2.1.1",
-    "ember-resolver": "^11.0.1",
-    "ember-source": "~5.5.0",
-    "ember-source-channel-url": "^3.0.0",
-    "loader.js": "^4.7.0",
-    "webpack": "^5.91.0"
-  },
   "engines": {
     "node": ">= 18",
     "npm": "please-use-yarn",
     "yarn": ">= 1.21.1"
   },
-  "ember": {
-    "edition": "default"
+  "exports": {
+    "./raw-handlebars-compiler": "./raw-handlebars-compiler.js"
   }
 }