RESTRICT AUTOMERGE parse userId from authority in opp in the same way as ContentProvider

Ensures that userId determination is consistent with ContentProvider

Bug: 395647005
Bug: 395643490
Flag: EXEMPT fix for vulnerability
Test: m com.google.android.bt
Test: atest BluetoothJavaUnitTests:com.android.bluetooth.opp.BluetoothOppSendFileInfoTest
Ignore-AOSP-First: fix for undisclosed vulnerability
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:05aa8869c2b6cbd15aba2d8e2cbdddf934b72f03)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:9dffd1fdd141bfc3b4420b2500cd5895276c2977)
Merged-In: Iacb9b1fc1fe48d9b8512f6e80bcc6eeb2a5bedbd
Change-Id: Iacb9b1fc1fe48d9b8512f6e80bcc6eeb2a5bedbd