Revert "[PM] Check unknown sources user restriction for intent installation"

This reverts commit 93f16fe40c18d12d83a547408194ff2b1ec4b728.

Reason for revert: b/450453592

Bug: 438352252
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:29962260bd043c197e411b690e862a318b31bae5
Merged-In: I026145f48ef27f2a28d3dacae83584a49565599e
Change-Id: I026145f48ef27f2a28d3dacae83584a49565599e