Add a watchdog mechanism to detect when the extension host JavaScript event loop is unresponsive (#26445)

"All workspace folders are equal which means there is notion of an active or master workspace folder."
-> "All workspace folders are equal which means there is **no** notion of an active or master workspace folder."

Layer breaker in: vs/workbench/services/themes/electron-browser/themeCompatibility.ts . Fixes #29077