[pm] skip the second user confirmation for unarchive with REQUEST_INSTALL_PACKAGES

For unarchive installers with a weaker permission, there's already a
confirmation dialog prompted to the user at the beginning of unarchive.
There's no need for a second user confirmation during the installation.

BUG: 311709794
Test: atest android.packageinstaller.uninstall.cts.ArchiveTest#unarchiveApp_weakPermissions

Change-Id: Ic2495b3ac964899c67fe52e92f9d3cc794d20256