fix(typescript): remove ember-cli-typescript

as described in [this pr](typed-ember/ember-cli-typescript#1568)
ember-cli-typescript is no longer needed, as are the prepack and
postpack scripts.

On top of removing an unnecessary dep, this actually solved an issue
allowing us to use yalc, which is very useful for "proper" npm linking
that simulates an actual package install (which can really help in
certain peerdep scenarios)

Author: abeforgit

index.js

@@ -6,6 +6,9 @@ module.exports = {
     return process.env.EMBER_ENV === 'development';
   },
   options: {
+    'ember-cli-babel': {
+      enableTypeScriptTransform: true,
+    },
     babel: {
       sourceMaps: 'inline',
     },

package-lock.json

@@ -22,9 +22,7 @@
     "test": "npm-run-all --print-name \"lint\" \"test:*\"",
     "test:ember": "ember test",
     "test:ember-compatibility": "ember try:each",
-    "release": "release-it",
-    "prepack": "ember ts:precompile",
-    "postpack": "ember ts:clean"
+    "release": "release-it"
   },
   "dependencies": {
     "@codemirror/lang-html": "^6.4.3",
@@ -43,7 +41,6 @@
     "ember-auto-import": "~2.6.3",
     "ember-cli-babel": "^7.26.11",
     "ember-cli-htmlbars": "^6.1.1",
-    "ember-cli-typescript": "^5.2.1",
     "ember-concurrency": "^2.3.7",
     "ember-mu-transform-helpers": "^2.0.0",
     "ember-power-select": "^6.0.1",