Add workaround for ANSI codes target-shell tests

[JSCU-CNI]

Should fix #1111. Only tested locally on uv cpython 3.12 and 3.13 so far, curious to see if the regular CI test environments still pass.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.85%. Comparing base (3c041e5) to head (424f708).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1117      +/-   ##
==========================================
+ Coverage   77.82%   77.85%   +0.03%     
==========================================
  Files         357      357              
  Lines       32363    32363              
==========================================
+ Hits        25185    25195      +10     
+ Misses       7178     7168      -10     

Flag	Coverage Δ
unittests	77.85% <100.00%> (+0.03%)	⬆️

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[JSCU-CNI]

Seems like we need to escape some additional characters and perhaps up the initial timeout for pypy.

[JSCU-CNI]

Seems like this is still broken on PyPy, regardless of the pexpect sanitation:

buffer (last 100 chars): b'ls /home/u\t\n/home/u: No such directory\nubuntu:/$ '

@Schamper I think we should disable these tests for PyPy again, or perhaps contact the PyPy maintainers ;)

[Schamper]

I can't reproduce either, let me at least fix the pypy3.9 tests because of the faulty version check, and then we can disable this test for PyPy3.10.