Allows equivalent answers with different "requiresExactMatch" values to have different feedback

[sjd210]

Currently a SYMBOLIC match to an EXACT answer will supersede all later matches to all other logicFormulaChoices (therefore always providing the default feedback).

This change allows for a special case with custom feedback to be given on questions with both "requiresExactMatch": true and "requiresExactMatch": false choices with the same answer.

e.g. Regression Test Page (Part H)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 34.38%. Comparing base (ff38e9b) to head (18a64d1).
Report is 24 commits behind head on master.

Files with missing lines	Patch %	Lines
...cl/dtg/isaac/quiz/IsaacSymbolicLogicValidator.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #635      +/-   ##
==========================================
- Coverage   34.40%   34.38%   -0.03%     
==========================================
  Files         514      514              
  Lines       23101    23112      +11     
  Branches     2792     2796       +4     
==========================================
- Hits         7948     7946       -2     
- Misses      14355    14364       +9     
- Partials      798      802       +4     

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[jsharkey13]

Without a lot of test cases, it's hard to be sure this is always fine; but it seems reasonable! Let's try it out!