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exodus: synchronize real file names with file names

Cory Quammen requested to merge cory.quammen/paraview:18839-exodus-restart-info-read-speedup into master

Changes in commit 4ddbf460 led to vtkFileSeriesReader::RequestInformation() opening every file in a set of Exodus parallel restart files to check for available time information. The RealFileNames internal member was not updated after vtkExodusFileSeriesReader modifies the list of FileNames, and continued to contain the full list of restart files. Since these "real" filenames are those checked for time information, this caused a major unnecessary slowdown. This commit solves the problem by synchronizing the RealFileNames mvar with the FileNames mvar at places where the vtkExodusFileSeriesReader modifies the FileNames vector.

Closes #18839 (closed)

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