Remove dead Python 3.9 guards and duplicate torch constant

[bhimrazy]

What does this PR do?

Small dead-code cleanup:

• Remove the duplicate _TORCH_GREATER_EQUAL_2_6 definition in fabric/utilities/imports.py.
• Drop _PYTHON_GREATER_EQUAL_3_9_0 guards in test_compile.py and test_hparams.py — the minimum supported Python is 3.10, so these are always true (and the test_hparams xfail condition never triggered).

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87%. Comparing base (fbdf042) to head (811ef26).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21847   +/-   ##
=======================================
- Coverage      87%      87%   -0%     
=======================================
  Files         270      270           
  Lines       24074    24073    -1     
=======================================
- Hits        20906    20902    -4     
- Misses       3168     3171    +3     

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