Block the content scheme intent in AccountTypePreferenceLoader

Also prevent intent defined in AccountPreference from leaking access

Bug: 366401629
Flag: EXEMPT security fix
Test: atest AccountTypePreferenceLoaderTest, manual
(cherry picked from commit 841fb384)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:4bacf6fff1dfbf4a045d28efdb5f1a041dad215e)
Merged-In: Ica87087341cc983df04190919e33dc369fa18619
Change-Id: Ica87087341cc983df04190919e33dc369fa18619