Remove TopkOp

[mory91]

Description

Related Issue

• Closes Remove TopKOp and related functionality #377

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.76%. Comparing base (ef22377) to head (9a3baf8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #686      +/-   ##
==========================================
- Coverage   80.86%   80.76%   -0.10%     
==========================================
  Files         162      162              
  Lines       46793    46694      -99     
  Branches    11442    11420      -22     
==========================================
- Hits        37837    37711     -126     
- Misses       6697     6734      +37     
+ Partials     2259     2249      -10     

Files	Coverage Δ
pytensor/tensor/rewriting/basic.py	94.31% <ø> (+0.16%)	⬆️
pytensor/tensor/sort.py	61.74% <100.00%> (-25.22%)	⬇️

... and 1 file with indirect coverage changes

[ricardoV94]

Thanks @mory91