stress_radial_cs_inner is very small when it should be 0

[timothy-nunn]

Some of the failures we have seen on main are from stress_radial_cs_inner switching between being a very small negative number or a very small positive number, both of which have the same absolute value. Changing the order of calculation in calculate_cs_radial_stress has stopped this from occurring and stress_radial_cs_inner is now exactly 0, which it should be.

Edit: this has worked on Mac to make it exactly 0 but Linux machines still seem to find a very small value (+/- 9.486166219722724e-08). It is possible that this has at least stopped the negative-positive flip flop but that will require some testing.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.64%. Comparing base (616f749) to head (431eb5a).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4436      +/-   ##
==========================================
+ Coverage   48.63%   48.64%   +0.01%     
==========================================
  Files         151      151              
  Lines       29673    29677       +4     
==========================================
+ Hits        14432    14437       +5     
+ Misses      15241    15240       -1     

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