This PR adds an e2e test to ensure that the background and UI environments are locked down. It reuses the logic from the `protect-intrinsics.test.js`, and runs in both Chrome and Firefox.
* Jestify migrations/
* Lint exclude migrations from mocha config, and add inclusion to jest config
* Add migration tests to jest config
* Exclude/ignore migration tests
* Set process.env.IN_TEST to true when running tests locally
* bump @metamask/controllers to v15.0.1 and remove AbortController workaround in e2e tests
* remove old abortcontroller polyfill
* bump @metamask/controllers to v15.0.2
