feat: prompt users to run /terminal-setup in supported terminals#19523

JagjeevanAK wants to merge 2 commits intogoogle-gemini:maingoogle-gemini/gemini-cli:mainfrom

JagjeevanAK:jagjeevan/issue-terminalsetupJagjeevanAK/gemini-cli:jagjeevan/issue-terminalsetupCopy head branch name to clipboard