Migrate tests for AddToCart button to Vite (#1899)

* Migrate tests for AddToCart button to Vite

In replacing the old providers, this is one way of doing it now with RTL. Not sure if this is better or not, but it does seem more clear to me?

* update vitest

* toBeDisabled()

* Simplify the rendering

Really, there's no need to add a level of abstraction when we can just do it directly.

packages/hydrogen/package.json

@@ -91,6 +91,7 @@
     "@rollup/plugin-graphql": "^1.0.0",
     "@testing-library/jest-dom": "^5.16.4",
     "@testing-library/react": "^13.3.0",
+    "@testing-library/user-event": "^14.3.0",
     "@types/body-parser": "^1.19.2",
     "@types/connect": "^3.4.34",
     "@types/graphql": "^14.5.0",
@@ -104,13 +105,13 @@
     "babel-loader": "^8.2.2",
     "cpy-cli": "^3.1.0",
     "eslint-plugin-import": "^2.26.0",
-    "happy-dom": "^6.0.3",
+    "happy-dom": "^6.0.4",
     "mkdirp": "^1.0.4",
     "npm-run-all": "^4.1.5",
     "postcss": "^8",
     "raw-loader": "^4.0.2",
     "rimraf": "^3.0.2",
-    "vitest": "^0.18.0"
+    "vitest": "^0.19.1"
   },
   "peerDependencies": {
     "body-parser": "^1.20.0",