Match dcgs for tomo multigrid

[stephen-riggs]

The data collection groups for atlas, metadata and fractions were not being matched up correctly for tomo multigrid.

This is due to the metadata being in Supervisor/Sample and the data in Supervisor_Sample

This resolves this issue by always using the metadata form with a slash. In the tomo context it checks the existence of the different metadata locations and determines the metadata_source and group_tag from this.

Also catches errors from being unable to read grid squares on a tomo atlas, and not copying the batch positions list.

[codecov]

Codecov Report

❌ Patch coverage is 26.66667% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.40%. Comparing base (28b4131) to head (8c02e89).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #819   +/-   ##
=======================================
  Coverage   52.39%   52.40%           
=======================================
  Files          98       98           
  Lines       10491    10509   +18     
  Branches     1385     1386    +1     
=======================================
+ Hits         5497     5507   +10     
- Misses       4705     4712    +7     
- Partials      289      290    +1     

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