Decouple local and remote operations in release script and add tests #2224
Description
Per discussion in #2199 (comment), doing the following would make testing, updating, and maintaining the release script easier:
- decouple the flow of the local-only operations (choosing the new versions and applying them both pre and post release) from operations on the Github remote (creating a draft release, creating PRs)
- add unit tests for the cleanly decoupled parts
- add flag or prompts to run local operations only for easier almost-end-to-end testing