Revisit building explicit loading filepaths rather than glob

[samlamont]

Using the fsspec.glob method to retrieve file paths to NWM netcdf files on GCS is simple and effective however only returns files that exist in the storage bucket, without knowing what to expect.

Explicitly building the file paths manually would require additional config dictionaries for each NWM configuration but would give us more control over the remote file paths and whether or not netcdf files are missing

Would primarily impact build_remote_filelist()