Remove the legacy int from FullScore.

This is a nice cleanup and will clear misunderstandings where
people mistakenly look at it in the logs.
Unfortunately it can't be removed from NetworkScore because there
are public APIs, and it's even used to transmit invincibility in
a legacy spur.

Bug: 238139913
Test: ConnectivityServiceTest
Change-Id: Ibdaf2b235b994383d5f8f42f1780b04bda80c93a
5 files changed