Modify sig fig feedback priority order

[axlewin]

The feedback priority order should now be:

1. Too many significant figures, but otherwise correct
2. Default feedback, if present
3. Too few significant figures, regardless of correctness

This makes numeric questions consistent with coordinate questions, where this was already the feedback order.

Note that we now always do sig fig checking (unless diregardSignificantFigurers is set) and overwrite the sig_figs_too_few feedback with the default feedback if necessary, instead of short-circuiting with the default feedback before the sig figs check. IMO this makes the code easier to follow since we're now only calling useDefaultFeedbackIfNecessary in one place, but we could add the short-circuit option back in between the two types of sig fig check.

Also moves the hardcoded sig_figs feedback tags to constants.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.01%. Comparing base (b4f8f70) to head (9a267dd).
⚠️ Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
...c/cam/cl/dtg/isaac/quiz/IsaacNumericValidator.java	83.33%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #818      +/-   ##
==========================================
+ Coverage   40.97%   41.01%   +0.03%     
==========================================
  Files         550      550              
  Lines       23555    23583      +28     
  Branches     2837     2845       +8     
==========================================
+ Hits         9652     9672      +20     
- Misses      13032    13039       +7     
- Partials      871      872       +1     

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[barna-isaac]

By removing this, we also override answer-specific feedback with sig. figs. For an example, see https://staging.isaacscience.org/questions/ft_mechanics_core_7, Part D, and enter 0.4, None as the answer.

[axlewin]

FWIW, even if this gets approved before next week's release, I'd advocate not merging this until the release after; I don't think that modifying this behaviour mid-STEM SMART residential when the content teams won't be available to test is sensible.