fix: replace fixed sleeps with polling in flaky TestChildProcessCleanup tests#2071

BabyChrist666 wants to merge 2 commits intomodelcontextprotocol:mainmodelcontextprotocol/python-sdk:mainfrom

BabyChrist666:fix/flaky-child-process-cleanup-tests-1775BabyChrist666/python-sdk:fix/flaky-child-process-cleanup-tests-1775Copy head branch name to clipboard