[Bug] Update developer guide to Yarn 4

[birkskyum]

After

• [chore]: Upgrade to yarn 4 #2610

I noticed some guides are broken. I.e. in the DEVELOPERS.md there is a step like

yarn global add puppeteer

It gives this error:

➜ yarn global install puppeteer
Usage Error: The 'yarn global' commands have been removed in 2.x - consider using 'yarn dlx' or a third-party plugin instead

Also, it seems like yarn really like to use Corepack, so maybe the volta has become redundant.

[ibgreen]

@birkskyum Thanks for reporting!

FWIW - We have a very big backlog of documentation updates. If the corrections are obvious, any PRs not matter how small are super welcome :)