Match grid squares on sample rather than tag if sample known

[stephen-riggs]

There is a problem with registering grid squares from an atlas, as the dcg tag is being used as the matching but this can change if atlas converts to SPA.

Instead, when registering squares from an atlas file, provide the sample and match this to a dcg. And send dcg request before that to make sure one will exist.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.93%. Comparing base (95769c0) to head (731e69b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #827      +/-   ##
==========================================
+ Coverage   52.90%   52.93%   +0.02%     
==========================================
  Files          99       99              
  Lines       10760    10763       +3     
  Branches     1415     1416       +1     
==========================================
+ Hits         5693     5697       +4     
+ Misses       4769     4768       -1     
  Partials      298      298              

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[tieneupin]

Looks good to me!