Pick latest version when stitching
Describe the bug
If we find more than one file when stitching, an error is immediately raised (https://gitlab.com/netcdf-scm/netcdf-scm/-/blob/master/src/netcdf_scm/stitching.py#L354). However, if the files come from two different folders, we should just pick the latest version.
Failing Test
TBD
Expected behavior
Simply pick the latest version and carry on.