test(browser): Remove webpack build tests

[AbhiPrasad]

Removes packages/browser/test/package/npm-build.js. This also means we can drop the webpack dev dep in the browser sdk package. Combining dropping webpack with upgrading fake-indexeddb to 6.0.0 means we can reduce the yarn.lock file by 1185 lines! Edit: I couldn't upgrade fake-indexeddb because of a jest/jsdom bug, will tackle it when we vitest this package!

packages/browser/test/package/npm-build.js contained three tests:

1. Test against tslib_1__default appearing in the bundle. I added a browser integration test to replicate this
2. Test that adding a bundled package would work, our integration + e2e tests pretty much cover this
3. Test that you can add bundle packages multiple times - our integration + e2e tests also cover this

I also migrated packages/utils/test/types/index.js to use jest instead of a plain script.

[Lms24]

Great stuff! Agree, all of this is covered by e2e and intregration tests. Goes to show how much better our testing capabilities have become in the last 2 years.