Add backchannel logout on user deletion #45537
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Centralize logout logic in UserSessionUtil.logoutAllUserSessions(). Add setNotBeforeForUser to invalidate tokens before deletion. Skip setNotBeforeForUser for lightweight users (they don't persist). Trigger backchannel logout for all user sessions (online and offline). Apply to all three deletion paths:
This ensures that when a user is deleted, all clients with backchannel logout URLs configured are notified via backchannel logout requests.
Closes #45120