Remove MANAGE_USERS from setPackagesSuspended

MANAGE_USERS is a widely used permission and setPackagesSuspended is a
dangerous API. Also having a lot of apps which can use the api can lead
to complications like them suspending each other.

Test: Existing tests with SUSPEND_APPS pass:
atest com.android.server.pm.SuspendPackagesTest

Existing permission tests without SUSPEND_APPS pass:
atest GtsSuspendAppsPermissionTestCases

Bug: 79773970
Change-Id: I49d81c0254c6ba528c50ece960a0db277c0afd7f