feat: Use stability test in flash

[dkachuma]

This PR adds a stability test before launching the negative two-phase flash. If the mixture is not found to be unstable for the test compositions during the stability test, it is simply labelled as liquid or vapour using the Li-correlation as described in the documentation. Only when the mixture is found to be unstable, is the negative two-phase flash launched.

• The Li-correlation requires the critical volumes. This makes the critical volume an input for all the two-phase compositional models (not just the ones that use LBC viscosity).
• The stability test is changed. Once a test composition is found that makes the TPD negative, the iterations are terminated even before reaching the stationary point.
• A description of the flash procedure is added to the CompositionalMultiphaseFluid rst.
• Some heuristics for single phase detection are removed from the flash.

[codecov]

Codecov Report

Attention: Patch coverage is 99.06542% with 2 lines in your changes missing coverage. Please review.

Project coverage is 56.36%. Comparing base (f6caac7) to head (10a55cd).
Report is 91 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ompositional/models/NegativeTwoPhaseFlashModel.hpp	95.45%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3206      +/-   ##
===========================================
+ Coverage    56.01%   56.36%   +0.34%     
===========================================
  Files         1053     1056       +3     
  Lines        89115    89233     +118     
===========================================
+ Hits         49919    50294     +375     
+ Misses       39196    38939     -257     

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[paveltomin]

review?