[PackageSetting] deep copy PackageUserState

+ fix copying of mSharedLibraryOverlayPaths
+ add missing copying of mFirstInstallTime
+ remove unused mCachedOverlayPaths

BUG: 202291547
Test: atest com.android.server.pm.PackageManagerSettingsTests
Test: atest CtsSuspendAppsTestCases
Change-Id: Iefaef66d5a4c45259fc7cbf2b3f7314d7cd494de