Speedup scalar Op python implementations

[ricardoV94]

Some cleanup of unused code in scalar/math.py.

Also speedup a bit the perform method by avoiding allocating intermediate variables and attribute acces for a helper function

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📚 Documentation preview 📚: https://pytensor--1169.org.readthedocs.build/en/1169/

[codecov]

Codecov Report

Attention: Patch coverage is 47.61905% with 22 lines in your changes missing coverage. Please review.

Project coverage is 82.27%. Comparing base (a0fe30d) to head (866f488).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
pytensor/scalar/math.py	36.36%	21 Missing ⚠️
pytensor/scalar/basic.py	88.88%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (47.61%) is below the target coverage (100.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1169      +/-   ##
==========================================
+ Coverage   82.11%   82.27%   +0.16%     
==========================================
  Files         186      186              
  Lines       48201    47927     -274     
  Branches     8679     8623      -56     
==========================================
- Hits        39579    39434     -145     
+ Misses       6447     6334     -113     
+ Partials     2175     2159      -16     

Files with missing lines	Coverage Δ
pytensor/scalar/basic.py	80.63% <88.88%> (+0.08%)	⬆️
pytensor/scalar/math.py	87.74% <36.36%> (+0.63%)	⬆️

... and 13 files with indirect coverage changes

[Armavica]

Looks good, but there are two more st_impl in pytensor/tensor/xlogx.py: worth removing them too in this PR?

[ricardoV94]

definitely, missed those