Individual convergent formulation flags

[zfergus]

Description

Replace the use_convergent_formulation flag in Collisions with two flags: use_area_weighting and use_improved_max_approximator. Move the physical barrier rescaling from collision weights into the BarrierPotential using a flag use_physcial_barrier.

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Existing unit tests

Test Configuration:

• OS and version: macOS 14.6.1
• Compile and version: Apple clang version 15.0.0

Checklist:

• I have followed the project style guide
• My code follows the clang-format style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Attention: Patch coverage is 95.50562% with 4 lines in your changes missing coverage. Please review.

Project coverage is 96.31%. Comparing base (416cdd4) to head (93958ac).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ipc/friction/collisions/friction_collision.cpp	76.92%	3 Missing ⚠️
src/ipc/collisions/collisions.cpp	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
+ Coverage   96.12%   96.31%   +0.19%     
==========================================
  Files         102      102              
  Lines        7584     7602      +18     
==========================================
+ Hits         7290     7322      +32     
+ Misses        294      280      -14     

Flag	Coverage Δ
unittests	96.31% <95.50%> (+0.19%)	⬆️

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