ci: generate and store openrpc.json with the tagged release artifacts

[ramin]

Adds a step in the ci_and_release pipeline to generate openrpc.json using make openrpc-gen and store that generated file with the release artifacts. This is set to run after go-releaser, though we could have made this its own workflow file potentially.

I have tested that release upload works in a personal repo, but as with all things on github, we can only REALLY test and do this one live 🤞

refs #2611