apex.unwanted_transitive_deps can break the APEX when any of listed deps
is actually needed. To avoid that, a new validation is added to see if
"unwanted" deps are actually not used by any ELF files in the APEX.
The new validation runs only for non-test apexes with
unwanted_transitive_deps set because test apexes can be broken
intentionally.
Bug: 295593640
Test: m com.android.virt
Change-Id: I29a3f7ef76b59594a08cfacca4811f16bf7172cc
55a7306aeb