gh-47798: Add a `subprocess.run_pipeline()` API#142080

gpshead wants to merge 12 commits intopython:mainpython/cpython:mainfrom

gpshead:claude/subprocess-pipe-chaining-01R27VPueru4RfRXYDsV5TmWgpshead/cpython:claude/subprocess-pipe-chaining-01R27VPueru4RfRXYDsV5TmWCopy head branch name to clipboard