chore: cleanup some old unused code

[delucis]

Summary

Spent a little bit of time investigating superfluous stuff in the repo using Knip. There’s quite a lot of potential cleanup work, but this PR sticks to some low hanging fruit (also to not make the PR too big to review).

• Removes some unused dependencies (mostly related to Webpack etc., likely left over from previous configurations)
• Refactors one small bit of code to use new URL() so the url npm package is no longer needed
• Deletes some code files that aren’t used anywhere (not imported by anything, not exposed publicly)

There’s more work where this is coming from, but next step would be removing unused exports etc. from code, which is a bit more delicate, so will save that for future PRs.

Test plan

Existing builds and tests should pass

Checklist

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[yanthomasdev]

Amazing work, LGTM!