Prefix titles with Python version during multiruns

[pawamoy]

# duties.py
MULTIRUN = os.environ.get("MULTIRUN", "0") == "1"


def pyprefix(title: str) -> str:  # noqa: D103
    if MULTIRUN:
        prefix = f"(python{sys.version_info.major}.{sys.version_info.minor})"
        return f"{prefix:14}{title}"
    return title

# scripts/multirun.sh
export MULTIRUN=1

# TODO: remove echo statements

It then looks like:

% make check
> Currently selected Python version: python3.9
✓ (python3.7)   Checking code quality
✓ (python3.7)   Type-checking
✓ (python3.7)   Building documentation
✓ (python3.8)   Checking code quality
✓ (python3.8)   Type-checking
✓ (python3.8)   Building documentation
✓ (python3.9)   Checking code quality
✓ (python3.9)   Type-checking
✓ (python3.9)   Building documentation
✓ (python3.10)  Checking code quality
✓ (python3.10)  Type-checking
✓ (python3.10)  Building documentation
✓ (python3.11)  Checking code quality
✓ (python3.11)  Type-checking
✓ (python3.11)  Building documentation
> Restored previous Python version: python3.9
✓ Exporting dependencies as requirements
✓ Checking dependencies

or

% make test
✓ (python3.7)   Running tests
✓ (python3.8)   Running tests
✓ (python3.9)   Running tests
✓ (python3.10)  Running tests
✓ (python3.11)  Running tests