Add switch to toggle strict inequality convergence criteria in VMCON

[timothy-nunn]

Adds a new switch force_vmcon_inequality_satisfication that allows one to turn on "strict" inequality mode: where an additional convergence criteria is added to VMCON that ensures all inequality constraints are exactly satisfied.

By default, this will be off (returning PROCESS to how it was pre-#3240).

I have tested this with large_tokamak_nof which is now failing with --reg-tolerance = 0.0; setting force_vmcon_inequality_satisfication = 1 causes the test to pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.67%. Comparing base (aff2888) to head (73f9de4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3858   +/-   ##
=======================================
  Coverage   46.67%   46.67%           
=======================================
  Files         122      122           
  Lines       27806    27809    +3     
=======================================
+ Hits        12978    12981    +3     
  Misses      14828    14828           

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