Add 3.3.0-preview3-pshopify1

[k0kubun]

This patch backports only bugfixes (and a few other relevant changes to avoid conflicts) on top of Ruby 3.3.0-preview3 so that we can deploy it to Core and (non-canary) SFR.

Diff: ruby/ruby@v3_3_0_preview3...Shopify:v3.3.0-preview3-pshopify1

[k0kubun]

I'll try running Core CI with this revision too.

[k0kubun]

It looks like now we want to run Ruby master (newer than 3.3.0-preview3) in production and 3.3.0-preview3 (without patches) in development, so I'm going to close this for now.

[casperisfine]

I think we should make a "3.3.0-preview3-pshopify1", but just point it at a recent master commit. We merged way too many bug fixes in the last couple weeks to make backporting viable.

[k0kubun]

Yeah, I was thinking of it too. When we need yet another bump to a random Ruby master, so be it (in pshopify2). But by deploying the current Ruby master that way, we also reserve an option to only backport a few patches to that pshopify1 when creating pshopify2, which might help the stability of production after the first upgrade.

Do we actually want to take that path then?

[casperisfine]

Do we actually want to take that path then?

Yeah, but after we have validated ome ref in production. That will allow us to "tag" that random ref and use the same in multiple apps more easily.

Anyway I expect the first beta/RCs in a couple weeks, so this isn't for long.