More specific type annotation for BaseJobExec.parse_status()

[nsoranzo]

Add type annotation to BaseJobExec.parse_single_status()

Follow-up on #17367 (comment) .

Needed to add TypeAlias to model.Job.states to fix:

lib/galaxy/jobs/runners/util/cli/job/__init__.py:67: error: Variable "galaxy.jobs.runners.util.cli.job.job_states" is not valid as a type  [valid-type]
        def parse_status(self, status: str, job_ids: List[str]) -> Dict[str, job_states]:
                                                                             ^

See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases :

You should always use TypeAlias to define a type alias in a class body
or inside a function.

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[mvdbeek]

Very nice, thank you!