Disallow device admin package and protected packages to be reinstalled as instant.

We should prevent the following types of apps from being reinstalled with
--install-existing as an instant.
(1)device admin package
(2)protected packages

Flag: EXEMPT bugfix

Bug: 341256043
Test: Manual test
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:77c5ebbd2a83e060577dd584aed7802452339ca5)
Merged-In: I4e913a12477fd4a64990033eaae533e30863e2a2
Change-Id: I4e913a12477fd4a64990033eaae533e30863e2a2