Move proxy debug info dumping back to Java.

This had to be called from native because serialization
was done from native, but now that serialization is in Java
we can move this back to a more logical place.

Also, this allows us to dump the per-UID proxy counts in
this situation again.

Bug: 109888955
Test: sailfish builds, proxy debug info shown on hitting limits
Change-Id: I4e06b3f93e30ed1c7868ec9e018709a7e796e441