[IDS-5273] Chore: Update deps to ensure using core-js 3.x

[sauntimo]

Warning

this build produces a static asset which is too big to deploy using the extensions deployment tool and will be fixed in the next PR to update the fsevents dependency. Don't roll back to this version.

✏️ Changes

• We don't use core-js as a top level dependency but it is a sub-dependency a few times over, and in particular through babel.
• I've used npm overrides to force babel-runtime, @babel/runtime and @babel/runtime-corejs2 to use @babel/runtime-corejs3, and to override any other usage of core-js to [email protected]
• I've removed several babel plugins in favour of @babel/preset-env which includes them
• A couple of other dependencies are updated to avoid outdated version of core-js
• a few "browserfiy" dependencies are removed in favour of node-polyfill-webpack-plugin which is easier than managing them all separately.
• Note that I pushed a commit to https://github.com/auth0-extensions/auth0-extensions-cli/tree/hacky-fix which you will need to npm link to build the extension.
• note, this fixes the socket.dev issue that the previous 2.x version of core-js is deprecated. It does not fix the socket.dev issue that core-js uses install scripts, because the most recent version still does.

🔗 References

• Jira ticket: https://auth0team.atlassian.net/browse/IDS-5273
• SEC ticket: https://auth0team.atlassian.net/browse/SEC-2163
• Socket.dev warnings;
  • version deprecated
  • install scripts

🎯 Testing

• ✅ 40/40 integration tests passing against a layer0 dev space
• ✅ 145/145 unit tests passing locally
• ✅ installed in a prod tenant (eu2) and smoke test manually using demozero extensions page

🚀 Deployment

✅ This can be deployed any time

🎡 Rollout

In order to verify that the deployment was successful we will test in a prod space both before and after we make this version available to customers.

🔥 Rollback

If there are issues with this version we will follow the disaster recovery plan for the authz extension.

[fbgoode]

LGTM, did exploratory testing in dev space