`test_sys` fails with `PYTHON_JIT_STRESS=1`

[markshannon]

Bug report

Bug description:

test_jit_is_active fails.
The bug is in the test, not the code, as _testinternalcapi uses a hard-coded value for the JIT threshold instead of the value from the config. It was probably overlooked in the process of implementing #141504

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

[markshannon]

@corona10

[corona10]

I will take a look at.