This script is only used for the github e2e tests so doesn't need to be
inside /bin

This should fix the test failures on `master` — currently tests are
failing because the cache was created with an old version of Node.

After #1115, new Node.js versions will be able to be used for
development of the frontend. This PR changes the recommended Node.js
version to 18 (the current LTS version). I have also tested with 16 and
20 and it works.

I also took the opportunity to:

- move the build script that was at the project root to the `bin/`
folder
- update the `browserslist` to target Electron 24 (which is the version
we currently build against). This results in a slightly smaller bundle
due to no longer having to transpile optional chaining.

Good catch @Jackenmen in
https://github.com/actualbudget/actual/pull/948#issuecomment-1580501909
— I’ve also added a CI check to ensure bad migrations aren’t introduced
in the future.

I think if you have a budget that has managed to have this migration
applied successfully, you’ll need to manually patch
`getAppliedMigrations` in
`packages/loot-core/src/server/migrate/migrations.ts` and inject a query
to remove the old migration ID and insert the new one.

*   upgrade github actions

* Upgrade actions/checkout