Adjust fallback options for dcg tag and cryolo model

[stephen-riggs]

• It is possible to see metadata files before Images-Disc1 exists, so we would need to assume that it will be Images-Disc1 in that case
• The cryolo model path cannot be resolved as it is a path in the cryolo processing pod

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.03%. Comparing base (a28e2fb) to head (de64297).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #732   +/-   ##
=======================================
  Coverage   46.03%   46.03%           
=======================================
  Files          91       91           
  Lines        9638     9638           
  Branches     1261     1261           
=======================================
  Hits         4437     4437           
  Misses       4980     4980           
  Partials      221      221           

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[tieneupin]

Looks good to me!