Disable traceback filtering after clearing session for tests

[haifeng-jin]

Disable traceback filtering after clearing session for tests.
Otherwise, it will be overwritten to True.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (689cd70) 78.50% compared to head (cdd5d85) 78.32%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #18660      +/-   ##
==========================================
- Coverage   78.50%   78.32%   -0.18%     
==========================================
  Files         334      334              
  Lines       32605    32605              
  Branches     6377     6377              
==========================================
- Hits        25595    25539      -56     
- Misses       5454     5509      +55     
- Partials     1556     1557       +1     

Flag	Coverage Δ
keras	78.22% <50.00%> (-0.16%)	⬇️
keras-jax	63.45% <50.00%> (-0.18%)	⬇️
keras-numpy	57.79% <50.00%> (-0.16%)	⬇️
keras-tensorflow	64.45% <50.00%> (-0.13%)	⬇️
keras-torch	65.17% <50.00%> (-0.20%)	⬇️

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Files	Coverage Δ
keras/testing/test_case.py	85.77% <50.00%> (-0.44%)	⬇️

... and 3 files with indirect coverage changes

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