Bring coord sig fig feedback in line with numeric questions

[axlewin]

Brings coordinate questions in line with numeric questions in terms of significant figures feedback.

Coordinate questions already showed sig figs feedback in the "correct but too many sig figs" case. This change adds feedback for the "too few sig figs, irrespective of correctness" case if and only if we have exhausted all other relevant feedback options, as is the case for numeric questions.

Also enables significant figures feedback for both subset cases (submission ⊂ correct choice, subset match choice ⊂ submission).

[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.94%. Comparing base (5d9c0c5) to head (97ec917).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...am/cl/dtg/isaac/quiz/IsaacCoordinateValidator.java	40.00%	18 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #761      +/-   ##
==========================================
- Coverage   39.95%   39.94%   -0.01%     
==========================================
  Files         546      546              
  Lines       23901    23927      +26     
  Branches     2873     2881       +8     
==========================================
+ Hits         9550     9558       +8     
- Misses      13444    13460      +16     
- Partials      907      909       +2     

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