Add task to build extension media (#119294)

This lets us avoid checking in the compiled js files that are used inside webviews and notebooks

extensions/microsoft-authentication/tsconfig.json

@@ -17,5 +17,6 @@
 		"strict": true,
 		"target": "es2019"
 	},
-	"exclude": ["node_modules"]
+	"exclude": ["node_modules"],
+	"include": ["src/**/*"]
 }