Re-enable pants_setup_requires:bin IT. (#6466)

The reason this target had resolution failures was fixed in #6460.

This is a partial fix for #6455.

tests/python/pants_test/projects/test_testprojects_integration.py

@@ -34,11 +34,6 @@ def targets(self):
       'testprojects/src/java/org/pantsbuild/testproject/thriftdeptest',
       # TODO(Eric Ayers): I don't understand why this fails
       'testprojects/src/java/org/pantsbuild/testproject/jvmprepcommand:compile-prep-command',
-      # TODO(#6455): this produces a resolution error in (currently) the test_shard_6() method with
-      # "Could not satisfy all requirements for hello_again==...", but the missing requirement is
-      # the one we're trying to satisfy, from the setup.py for the python_dist() target in the same
-      # directory!
-      'examples/src/python/example/python_distribution/hello/pants_setup_requires:bin',
     ]
 
     # Targets that are intended to fail