Fix post-release workflows

[brophdawg11]

I noticed that CI wasn't commenting on issues after releases recently, and it looks like the Find Package job was failing due to a missing npm->pnpm update so it was looking for a package-lock.json file and erroring out: https://github.com/remix-run/remix/actions/runs/8818933926/job/24209000833

I also commented out the deployments and stacks tests since I don't think they've passed in quite some time. Maybe after things simplify in the next version we can revisit that idea - would be great to have those running reliably again - even if on a subset of platforms: https://github.com/remix-run/remix/actions/runs/8162173613

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