Fixes for SmartEM integration

[d-j-hatton]

A few things that came up in testing:

• Atlas storage folder needs to be set to the destination so it is visible from the server
• A DCG tag needs to be used to identify the correct data collection group so that the SmartEM UUID for the grid can be retrieved

[codecov]

Codecov Report

❌ Patch coverage is 11.11111% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.88%. Comparing base (ad5e512) to head (c9aa896).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #777      +/-   ##
==========================================
- Coverage   48.89%   48.88%   -0.01%     
==========================================
  Files          94       94              
  Lines       10008    10012       +4     
  Branches     1326     1327       +1     
==========================================
+ Hits         4893     4894       +1     
- Misses       4860     4863       +3     
  Partials      255      255              

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