Avoid disabling jit on guvectorised functions

[timothymillar]

• [x] Fixes #1194

Leaving NUMBA_DISABLE_JIT=1 for test_pedigree.py which contains many jitted functions.

[timothymillar]

Hmm, not sure what to do about coverage here

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (6b10a77) to head (e315f52).

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Additional details and impacted files

@@            Coverage Diff             @@
##              main     #1199    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           52        52            
  Lines         5204      4353   -851     
==========================================
- Hits          5204      4353   -851     

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[timothymillar]

This still runs tests with the jit disabled for two files:

• sgkit/tests/test_pedigree.py
• sgkit/tests/io/vcf/test_vcf_writer_utils.py

Both of these files have lots njit functions without guvectorize. This is a bit fragile so we'll see if it sticks around.

I also looked into using pytest to mark certain tests for running with the jit disabled. This doesn't work because the guvectorize functions are compiled at import time which happens even if the tests are deselected.