Remove SurveyModel.get_field_of_regard

[lpsinger]

This is a duplicate of the Mission.get_field_of_regard method.

Please test this before approving.

[codecov]

Codecov Report

Merging #52 (51b5559) into main (8b9b094) will decrease coverage by 0.17%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
- Coverage   26.79%   26.61%   -0.18%     
==========================================
  Files          28       28              
  Lines        1351     1345       -6     
==========================================
- Hits          362      358       -4     
+ Misses        989      987       -2     

Impacted Files	Coverage Δ
dorado/scheduling/models.py	36.84% <ø> (-7.16%)	⬇️
dorado/scheduling/scripts/animate_survey.py	5.29% <0.00%> (ø)

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[mcoughlin]

Pulled down the repo, seemed to work well.