DBG try to debug the thread_bomb_mitigation test

[tomMoral]

Investigation PR for #1150

From the investigation, this bug seems to be related to a bad interaction between the test, Pypy and coverage.
I propose to disable the coverage on this test to stabilize the test suite.

I was able to reproduce the failure locally by running the test with --cov=joblib and by adding the following at the beginning of the test:

def test_thread_bomb_mitigation(backend):
    def recursive():
        return recursive()
    with raises(RecursionError):
        recursive()

This could be investigated further if someone has the time to do so.

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.01 ⚠️

Comparison is base (60ec53d) 94.76% compared to head (8b4e5b8) 94.75%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1424      +/-   ##
==========================================
- Coverage   94.76%   94.75%   -0.01%     
==========================================
  Files          45       45              
  Lines        6890     6918      +28     
==========================================
+ Hits         6529     6555      +26     
- Misses        361      363       +2     

Impacted Files	Coverage Δ
joblib/test/test_parallel.py	96.07% <50.00%> (-1.08%)	⬇️

... and 6 files with indirect coverage changes

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