Remove redundant gates after depth-optimal synthesis.

[pehamTom]

Description

Remove redundant gates in post-processing step after depth-optimal synthesis

Fixes #325

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• 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.

[github-actions]

Cpp-Linter Report ✔️

No problems need attention.

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[burgholzer]

LGTM 👍🏻

[codecov]

Codecov Report

Merging #336 (6d2a179) into main (19ba74f) will increase coverage by 0.0%.
The diff coverage is 100.0%.

@@          Coverage Diff          @@
##            main    #336   +/-   ##
=====================================
  Coverage   92.1%   92.1%           
=====================================
  Files         44      44           
  Lines       4144    4160   +16     
  Branches     695     698    +3     
=====================================
+ Hits        3819    3835   +16     
  Misses       325     325           

Flag	Coverage Δ
cpp	91.7% <100.0%> (+<0.1%)	⬆️
python	95.9% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
include/cliffordsynthesis/CliffordSynthesizer.hpp	88.8% <ø> (ø)
src/cliffordsynthesis/CliffordSynthesizer.cpp	97.4% <100.0%> (+0.1%)	⬆️

... and 1 file with indirect coverage changes