Do not update scaup for atlases if two dcgs exist

[stephen-riggs]

To try and avoid the case where scaup directs to the atlas dcg when a processing one also exists.

Checks to see if the tag is an atlas and if so does not do the scaup updates if we have another dcg

[codecov]

Codecov Report

❌ Patch coverage is 43.47826% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.17%. Comparing base (8fb34a2) to head (6e374f1).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #743      +/-   ##
==========================================
+ Coverage   46.65%   48.17%   +1.52%     
==========================================
  Files          91       91              
  Lines        9607    10183     +576     
  Branches     1255     1358     +103     
==========================================
+ Hits         4482     4906     +424     
- Misses       4912     5039     +127     
- Partials      213      238      +25     

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