Release the redirect probe's connection in codegen

The probe reads the status line and one header, so the body is never consumed
and the socket cannot return to the keep-alive pool by itself. wsdl2java also
runs from the ant task and the wsdl2code maven plugin, generating for many
WSDLs in one build JVM, so disconnect() in a finally block rather than waiting
on finalization.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>