CI updates

[harmony7]

This PR modernizes the CI workflows in this repo

1. Docs

   • Update docs workflow to use npm 22
   • Lock static publisher to the version that was newest at the time this was published last
     • This is important because the newer versions of static publisher don't work exactly the same way

2. Release

   • Update to npm 22
   • Switch from yarn to npm
   • Switch from prepublish script to prepack script for running npm run test and npm run build
   • Switch from using .npmignore (denylist) to the files entry in package.json (allowlist) for specifying what goes into the final tarball
   • Switch from using auto to https://github.com/fastly/devex-reusable-workflows
   • Remove some unused dependencies

Now, instead of getting a bunch of canary releases in npm on each push

We'll control our version releases using a tag that starts with a v, the same as we do in other repos

I've double checked that the contents of the tarball that is built under the new process is compatible with the tarball from the 2.3.0 currently on npmjs.

[kailan]

Great stuff, thanks Kats