build: remove unused packages

package.json

@@ -51,8 +51,6 @@
     "@ember/optional-features": "^2.0.0",
     "@ember/test-helpers": "^2.4.0",
     "@embroider/test-setup": "^0.47.0",
-    "@glimmer/component": "^1.0.3",
-    "@glimmer/tracking": "^1.0.3",
     "@types/ember-qunit": "^3.4.14",
     "@types/ember-resolver": "^5.0.10",
     "@types/ember__application": "^3.16.3",
@@ -65,19 +63,15 @@
     "@typescript-eslint/eslint-plugin": "^4.30.0",
     "@typescript-eslint/parser": "^4.30.0",
     "babel-eslint": "^10.1.0",
-    "broccoli-asset-rev": "^3.0.0",
     "ember-auto-import": "^1.11.3",
     "ember-cli": "~3.24.0",
     "ember-cli-dependency-checker": "^3.2.0",
-    "ember-cli-inject-live-reload": "^2.1.0",
-    "ember-cli-sri": "^2.1.1",
     "ember-cli-terser": "^4.0.2",
     "ember-cli-typescript-blueprints": "^3.0.0",
     "ember-disable-prototype-extensions": "^1.1.3",
     "ember-export-application-global": "^2.0.1",
     "ember-load-initializers": "^2.1.2",
     "ember-maybe-import-regenerator": "^1.0.0",
-    "ember-page-title": "^6.0.3",
     "ember-qunit": "^5.1.1",
     "ember-resolver": "^8.0.2",
     "ember-source": "~3.26.1",

tests/dummy/app/templates/application.hbs

@@ -1,5 +1,3 @@
-{{page-title "Dummy"}}
-
 <h2 id="title">Welcome to Ember</h2>
 
 {{outlet}}