Ember: Remove @embroider/test-setup Dependency (#3460)

* chore: `yarn.lock` update

The `yarn.lock` on `master` seems to be in an invalid state; these
changes happen by just running `yarn install` without even changing any
of the `package.json` files.

* fix(ember): mark `@embroider/test-setup` as a dev dependency

This package is only used for testing purposes, and should not be
a dependency of an Ember addon.

* chore(ember): remove unused `@embroider/compat` package

Author: alexlafroscia

packages/ember/package.json

@@ -32,7 +32,6 @@
   },
   "dependencies": {
     "@embroider/macros": ">=0.25.0",
-    "@embroider/test-setup": "^0.35.1",
     "@sentry/browser": "6.3.1",
     "@sentry/tracing": "6.3.1",
     "@sentry/types": "6.3.1",
@@ -44,7 +43,7 @@
   },
   "devDependencies": {
     "@ember/optional-features": "^1.3.0",
-    "@embroider/compat": "^0.35.1",
+    "@embroider/test-setup": "^0.35.1",
     "@glimmer/component": "^1.0.0",
     "@glimmer/tracking": "^1.0.0",
     "@sentry-internal/eslint-config-sdk": "6.3.1",