remove unused, untested function

There is a split_commas function in daf_butler that can be used.
It can be extended to do type conversion (as this one did, to
int), or we could write a helper to convert a list of Any items
to a list of int items that could be chained with split_commas.

python/lsst/ctrl/mpexec/cli/opt/options.py

@@ -22,44 +22,6 @@
 import click
 from lsst.daf.butler.cli.utils import MWOptionDecorator, MWPath, split_commas, unwrap
 
-
-def _split_commas_int(context, param, values):
-    """Special callback that handles comma-separated list of integers.
-
-    Parameters
-    ----------
-    context : `click.Context` or `None`
-        The current execution context.
-    param : `click.core.Option` or `None`
-        The parameter being handled.
-    values : `list` [ `str` ]
-        All the values passed for this option. Strings may contain commas,
-        which will be treated as delimiters for separate values.
-
-    Returns
-    -------
-    numbers : `tuple` [ `int` ]
-        The passed in values separated by commas and combined into a single
-        list.
-    """
-
-    def _to_int(value):
-        """Convert string to integer, handle errors."""
-        try:
-            return int(value)
-        except ValueError:
-            raise click.BadParameter(
-                message=f"'{value}' is not a valid integer",
-                ctx=context,
-                param=param,
-            )
-
-    values = split_commas(context, param, values)
-    if values is None:
-        return values
-    return tuple(_to_int(value) for value in values)
-
-
 butler_config_option = MWOptionDecorator(
     "-b", "--butler-config", help="Location of the gen3 butler/registry config file."
 )