Clean test_Elemwise

[PabloRoque]

Description

Minor cleanup of test_Elemwise. Carryover from #1535.

1. Removes a constant exec param since it never changes
2. Introduce ids to improve test readability
3. Removes a dangling context manager

Related Issue

• Closes #
• Related to Remove uses of numba_basic.global_numba_func #1535

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):

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📚 Documentation preview 📚: https://pytensor--1536.org.readthedocs.build/en/1536/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.86%. Comparing base (7efd1c5) to head (dd2c41c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1536   +/-   ##
=======================================
  Coverage   81.86%   81.86%           
=======================================
  Files         230      230           
  Lines       52508    52508           
  Branches     9339     9339           
=======================================
  Hits        42987    42987           
  Misses       7089     7089           
  Partials     2432     2432           

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[ricardoV94]

Thanks