Replace Yarn PnP w/ Yarn 2

[arcanis]

Since Yarn 2 has PnP enabled (with a better implementation as Yarn 1), I think it would make more sense to use that.

To use Yarn 2, the following command has to be run within the project outside of the benchmark:

yarn policies set-version berry

Some other particularities:

• to remove the cache, better use yarn cache clean --all. You also can add enableGlobalCache which will use a unique cache (otherwise it'll have a first global cache, then a per-project cache).

• when removing the n_m, you'll instead want to remove the .pnp.js file for PnP (I think it's currently marked as n/a)

[zkochan]

I don't have objections

[omeid]

I would prefer if it was added along with yarn PnP than replaced, it should give a better picture of the overall packaging landscape.

[arcanis]

Not really, the 1.x PnP implem was an experiment branch we never bumped to production. The amount of people who care about that is small.

[omeid]

Can you explain what do you mean by bumped to production?

[doamatto]

Bumping and +1. Would be great to know if it's worth switching from Yarn 2 from a benchmarking POV