Make yarn build command cross-platform

[alexanderleecii]

Short description

The build npm script currently fails on non-unix platforms where rm is not defined. This PR makes the script cross-platform.
Resolves #3746

Implementation details

1. Created a scripts/clean.cjs script to recursively delete dist folder using nodejs APIs
2. Added a clean npm script which calls scripts/clean.cjs
3. Call npm run clean instead of rm -rf dist in build npm script

How to test it

Run yarn build. Any existing dist folder should be removed and the build process should execute correctly.

Checklist

• This PR is covered by e2e tests
• It introduces no breaking API changes

[katspaugh]

Thanks!

[katspaugh]

👍