Move dexopt out of the package freezer.

The dexopt takes a long time, move it out of the package freezer to
to unblock installer.

Bug: 321139675
Flag: android.content.pm.improve_install_freeze
Test: atest CtsPackageManagerTestCases
Test: atest CtsInstallHostTestCases
Test: atest CtsCompilationTestCases
Change-Id: Ieffaf141fddda8966e97fe5575951e3190b993ee