feat: On window focus, redirect to login if the user has been logged out (#18773)

* /me api

* test it

* watch for window activation and check auth

* simplify

* more comment

* making ci happy

* mypy should ignore tests

tests/integration_tests/security_tests.py

@@ -906,6 +906,7 @@ class TestRolePermission(SupersetTestCase):
             ["LocaleView", "index"],
             ["AuthDBView", "login"],
             ["AuthDBView", "logout"],
+            ["CurrentUserRestApi", "me"],
             ["Dashboard", "embedded"],
             ["R", "index"],
             ["Superset", "log"],