feat: use custom release please script

[lukekarrys]

No description provided.

[lukekarrys]

See npm/npm-cli-release-please#3 as an example release PR built with this new process.

One important note is that we used to update package-lock with a deps commit, but now that this is all part of a single PR we shouldn't include anything but chore commits in the release PR.

Workspace deps still get called out in the root changelog/release, but we won't be able to trigger a release from only updating a workspace. I think we would always have some sort of root code change in the CLI along with a workspace change, so I think this is an ok tradeoff.

[lukekarrys]

A few more things I want to test here:

• Calling a reusable workflow to test a release after the commits are pushed to a PR
  • This is working to call a workflow to test a release https://github.com/npm/npm-cli-release-please/actions/runs/2952613949. One thing it doesn't have is the check assigned to the PR since it is created by a different workflow.
• Prereleases (not a showstopper but curious how they work with workspaces)

[lukekarrys]

One thing it doesn't have is the check assigned to the PR since it is created by a different workflow.

Punting on this until later. For now, we will have to manually find the release-test workflow and wait for it to finish in order to know a release is passing.