🐛 Fixed multiple post_layout_optimization bugs

[simon1hofmann]

Description

Fixed two bugs in post_layout_optimization:

• Calculation of the minimal border for the relocation of POs
• Maximum number of gate relocations for POs should not be limited

Fixed a special case in wiring_reduction for double fanin gates:

In a layout, a structure like this can appear:

+ → =
↓   ↓
=   =
↓   ↓
= → &

Using A*, two paths can be found for deletion, which leads to:
+ → &

Therefore, the wire to the left of the AND gate is blocked so only one path can be found.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have added a changelog entry.
• I have created/adjusted the Python bindings for any new or updated functionality.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[marcelwa]

Could you also please adjust the PR description? Currently, it is misformed.

Additionally, it would be great to explain in the description how the bug could be reproduced or triggered. If you want, you could open a respective issue instead and link to that here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.23%. Comparing base (c7aa98c) to head (aae1b3c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #472   +/-   ##
=======================================
  Coverage   98.22%   98.23%           
=======================================
  Files         214      214           
  Lines       28904    28959   +55     
  Branches     1369     1380   +11     
=======================================
+ Hits        28391    28447   +56     
+ Misses        513      512    -1     

Files	Coverage Δ
...ithms/physical_design/post_layout_optimization.hpp	100.00% <100.00%> (ø)
...on/algorithms/physical_design/wiring_reduction.hpp	98.69% <100.00%> (+0.03%)	⬆️

... and 5 files with indirect coverage changes

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