Save paths in least_cost_paths_cli and least_cost_xmission_cli not working

[WilliamsTravis]

Bug Description
When running the least cost path cli with save_paths=True, the .to_file method fails because the output is not converted to a geodataframe first. At this line here, the pandas concat method is creating a pandas data frame.

Traceback

Traceback (most recent call last):
  File "/lustre/eaglefs/shared-projects/rev/modulefiles/alternate_envs/devruns/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/lustre/eaglefs/shared-projects/rev/modulefiles/alternate_envs/devruns/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/lustre/eaglefs/shared-projects/rev/modulefiles/alternate_repos/reVX/reVX/least_cost_xmission/least_cost_paths_cli.py", line 386, in <module>
    main(obj={})
  File "/lustre/eaglefs/shared-projects/rev/modulefiles/alternate_envs/devruns/lib/python3.9/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "/lustre/eaglefs/shared-projects/rev/modulefiles/alternate_envs/devruns/lib/python3.9/site-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
  File "/lustre/eaglefs/shared-projects/rev/modulefiles/alternate_envs/devruns/lib/python3.9/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/lustre/eaglefs/shared-projects/rev/modulefiles/alternate_envs/devruns/lib/python3.9/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/lustre/eaglefs/shared-projects/rev/modulefiles/alternate_envs/devruns/lib/python3.9/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "/lustre/eaglefs/shared-projects/rev/modulefiles/alternate_envs/devruns/lib/python3.9/site-packages/click/decorators.py", line 26, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/lustre/eaglefs/shared-projects/rev/modulefiles/alternate_repos/reVX/reVX/least_cost_xmission/least_cost_paths_cli.py", line 227, in local
    least_costs.to_file(fpath_out, driver="GPKG", index=False)
  File "/lustre/eaglefs/shared-projects/rev/modulefiles/alternate_envs/devruns/lib/python3.9/site-packages/pandas/core/generic.py", line 5902, in __getattr__
    return object.__getattribute__(self, name)
AttributeError: 'DataFrame' object has no attribute 'to_file'

[ppinchuk]

Should have some time to dig into this during the next transmission routing upgrade coming up soon