vtkSMReaderReloadHelper: support reloading directories
vtkSMReaderReloadHelper only supported scanning for files and file groups. Making it support directories and directory groups.
Fixes #20223 (closed).
Closes #20223 (closed)
todo:
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while this seems to work, the AMReX reader's timestep end up getting incorrect values on reload..need to figure out why.
Edited by Utkarsh Ayachit