Remove dead IsStdoutTerminal() and simplify containsAny test helper#1494

lpcox merged 2 commits intomaingithub/gh-aw-mcpg:mainfrom

copilot/review-go-module-golang-org-x-termgithub/gh-aw-mcpg:copilot/review-go-module-golang-org-x-termCopy head branch name to clipboard