Generate VOL tests for h5diff

[mattjala]

Depends on both #5551 and #5675. Marked as draft and won't pass CI until those are merged.

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Important

Add VOL tests for h5diff with new macros and test configurations in CMakeTests.cmake.

• Behavior:
  • Adds VOL tests for h5diff in CMakeTests.cmake.
  • Tests include scenarios for different VOL connectors and configurations.
  • Tests are added for both serial and parallel execution where applicable.
• Macros:
  • Adds HDF5_GET_VOL_TGT_INFO macro in HDF5Macros.cmake to retrieve VOL connector information.
  • Updates ADD_H5_TEST, ADD_SH5_TEST, and ADD_PH5_TEST macros in h5diff/CMakeTests.cmake to support VOL testing.
• Misc:
  • Updates vol_cache.yml and vol_rest.yml workflows to exclude certain tests.
  • Adjusts test setup in h5copy/CMakeTests.cmake to accommodate VOL tests.

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