Revert "Move showing keyguard after the UserSwitchObservers."

This reverts commit d1ca5129.

Reason for revert: Revert to fix build Red on AP2A.240805.004.F1

Bug: 331853529
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:9b74632ed45a7edada84680b18da5c7936dd5779)
Merged-In: Ia5a2f0fc6c7b98a09163136a41121058c0faff36
Change-Id: Ia5a2f0fc6c7b98a09163136a41121058c0faff36