Fixes for tomo multigrid destinations

[stephen-riggs]

• Destination should be from sample not d
• Name tomo metadata as metadata_Supervisor_..._SampleX
• Match fractions and metadata in the destinations directory

[codecov]

Codecov Report

❌ Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.93%. Comparing base (297dd98) to head (b6386e4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #664      +/-   ##
==========================================
- Coverage   33.94%   33.93%   -0.02%     
==========================================
  Files          92       92              
  Lines       11174    11178       +4     
  Branches     1470     1472       +2     
==========================================
  Hits         3793     3793              
- Misses       7252     7256       +4     
  Partials      129      129              

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[d-j-hatton]

Thanks