Changes to enable transfer and processing of Tomo5 multigrid data

[d-j-hatton]

Multigrid tomo metadata is structured with an intermediate layer:

• session directory
  • sample directories (named Sample* as with atlas directories)
    • tomo metadata

The corresponding fractions directories are then named {session directory}_{Sample*}

Here we attempt to deal with this at the earliest possible stage, starting metadata rsyncers for the Sample* directories and hoping that everything else follows. The determination of the correct fractions directory obviously must also change for this case.

[codecov]

Codecov Report

❌ Patch coverage is 8.33333% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.94%. Comparing base (96a75f2) to head (09b9a24).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #662      +/-   ##
==========================================
+ Coverage   33.91%   33.94%   +0.02%     
==========================================
  Files          93       92       -1     
  Lines       11236    11174      -62     
  Branches     1475     1470       -5     
==========================================
- Hits         3811     3793      -18     
+ Misses       7295     7252      -43     
+ Partials      130      129       -1     

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