Fix xtensor (...,) Transpose

[ricardoV94]

The implementation wrongly considered x.transpose(...) as a reverse transpose, but it's just a no-op in that cas.

Also renamed the user-facing kwarg to dim to be aligned with xarray.

CC @AllenDowney

---

📚 Documentation preview 📚: https://pytensor--1500.org.readthedocs.build/en/1500/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.99%. Comparing base (236e50d) to head (8f1df3b).
⚠️ Report is 119 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1500   +/-   ##
=======================================
  Coverage   81.98%   81.99%           
=======================================
  Files         231      231           
  Lines       52192    52253   +61     
  Branches     9185     9203   +18     
=======================================
+ Hits        42790    42843   +53     
- Misses       7094     7099    +5     
- Partials     2308     2311    +3     

Files with missing lines	Coverage Δ
pytensor/xtensor/shape.py	77.85% <100.00%> (+0.33%)	⬆️
pytensor/xtensor/type.py	68.28% <100.00%> (ø)

... and 6 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.