Prevent spammy remote exception logging

This change is a (mostly) non-functional change to simplify the
notification of RLP changes to proxy routers, while also improving the
logging that occurs when the binder transaction fails.

Bug: 360129098
Test: Manual simple RLP flow using routing demo app
Flag: EXEMPT refactor
Change-Id: I7b6a0559f642a3419a2fb3e062d6ad70a93fe8f3