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Unknown default compression setting in Sprucing

cc @lugrazet @nskidmor @cburr

The default compression settings for sprucing jobs is unclear.
!3795 adds the ability to configure this for gaudirun, and uses it in the BW Tests. However as can be seen in this thread !3795 (comment 8399019) it's not clear what the default is when left unspecified.

The assumption was that the default is ZSTD:1, but it was shown (!3795 (comment 8453737)) that

  • That the ZSTD:1 -> LZMA:4 does replicate a 20% reduction as we expect.
  • The difference between not specifying any compression when running Moore and LZMA:4 is consistent with 0.

ToDo

  • Try and understand what the default compression setting is.