Address intermittent TeeStream test failure

[jsiirola]

Fixes # .

Summary/Motivation:

This makes an attempt at addressing an intermittent test failure in the TeeStream buffering tests. We are occasionally seeing instances where pyomo/common/tests/test_tee.py::TestBuffering_noCapture::test_buffered_stdout_flush fails because the flush() does not appear to actually flush the output stream. This PR doesn't actually fix the underlying issue and instead adds an automatic retry before failing the test.

Changes proposed in this PR:

• Automatically retry pyomo/common/tests/test_tee.py::TestBuffering_noCapture::test_buffered_stdout_flush if the first attempt would have led to a failure.

Legal Acknowledgement

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1. I agree my contributions are submitted under the BSD license.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.66%. Comparing base (8a50553) to head (98fbb97).
Report is 47 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3465      +/-   ##
==========================================
+ Coverage   88.19%   88.66%   +0.47%     
==========================================
  Files         880      880              
  Lines      100594   101307     +713     
==========================================
+ Hits        88715    89827    +1112     
+ Misses      11879    11480     -399     

Flag	Coverage Δ
linux	86.19% <ø> (+0.01%)	⬆️
osx	76.19% <ø> (+0.01%)	⬆️
other	86.72% <ø> (+0.02%)	⬆️
win	84.67% <ø> (+0.02%)	⬆️

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