fix: detect MCP session disconnect to avoid ~5min hang on HTTP errors#4906

Ratnaditya-J wants to merge 3 commits intogoogle:maingoogle/adk-python:mainfrom

Ratnaditya-J:fix/mcp-http-error-hangRatnaditya-J/adk-python:fix/mcp-http-error-hangCopy head branch name to clipboard