Significantly improve release version validation

[pradyunsg]

Closes #7952

Notably:

• Allows pre-releases and post-releases.
  • No alpha or dev releases, only beta.
• Uses a subprocess to actually do the version validation (sorry Windows users!)
  • Need packaging for validation, but don't want to add that as an extra release process step.

[uranusjr]

To general idea LGTM. I think this is good to go as long as the implementation works :p

[pradyunsg]

What do you mean by "as long as the implementation works"? It's clearly working. 😝

[pradyunsg]

More seriously though, how exactly did mypy not catch that?

[uranusjr]

IIUC Mypy only typecheck if eveything function on the code path is somewhat type hinted. I bet it never reached get_version_from_argument because nothing calling it has type hints.

[pradyunsg]

tools/automation/release/__init__.py:14: error: Cannot find implementation or library stub for module named 'nox.sessions'
noxfile.py:12: error: Cannot find implementation or library stub for module named 'nox'

Running w/ a couple of configuration options changed reveals why... nox doesn't have type annotations and we don't install it in the pre-commit environment anyway. Even though we were type-checking that function... it just assigned Any to Session. :)

[pradyunsg]

tools/automation/release/__init__.py:23: note: Revealed type is 'Any'

Theory confirmed. :)

[pradyunsg]

Merging since I have a green tick from @uranusjr and CI. :)