Create version file in python pipeline

The Python pipeline needs to create a version file so that the application has access to its version at runtime.

The setuptools-scm package produces a file that looks like this:

# file generated by setuptools-scm
# don't change, don't track in version control

__all__ = ["__version__", "__version_tuple__", "version", "version_tuple"]

TYPE_CHECKING = False
if TYPE_CHECKING:
    from typing import Tuple
    from typing import Union

    VERSION_TUPLE = Tuple[Union[int, str], ...]
else:
    VERSION_TUPLE = object

version: str
__version__: str
__version_tuple__: VERSION_TUPLE
version_tuple: VERSION_TUPLE

__version__ = version = '0.4.2.dev0+gdf0ff81.d20250723'
__version_tuple__ = version_tuple = (0, 4, 2, 'dev0', 'gdf0ff81.d20250723')

I think this might be a bit much, but we can do something like this to emulate:

__version__ = version = '0.0.0'
__version_tuple__ = version_tuple = (0, 4, 2)

The location where this file is written can be set with PYTHON_TAG_VERSION_FILE, or turned off by setting to an empty string. The default value is $PYTHON_PACKAGE/_version.py.