feat: enable dynamic scenario termination from closing display

[abanuelo]

Description

Feature that allows users to manually close out a dynamic scenario by closing out the display via the UI and continue subsequent simulations to continue. Here is a video illustrating the working changes

pygame_fixed.mov

Issue Link

Checklist

• I have tested the changes locally via pytest and/or other means
• I have added or updated relevant documentation
• I have autoformatted the code with black and isort
• I have added test cases (if applicable)

Additional Notes

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 91.33%. Comparing base (a6e48a2) to head (dcb3111).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/scenic/simulators/newtonian/simulator.py	60.00%	2 Missing ⚠️
src/scenic/core/simulators.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
- Coverage   91.35%   91.33%   -0.02%     
==========================================
  Files          54       54              
  Lines       13568    13577       +9     
==========================================
+ Hits        12395    12401       +6     
- Misses       1173     1176       +3     

Files with missing lines	Coverage Δ
src/scenic/core/simulators.py	96.25% <75.00%> (-0.25%)	⬇️
src/scenic/simulators/newtonian/simulator.py	89.30% <60.00%> (-0.70%)	⬇️

... and 5 files with indirect coverage changes

[Eric-Vin]

Tested locally, and it works great, thanks Armando!

[lola831]

Tested locally and it works.