gfe-relnote: In QUIC, rewrite QuicStreamIdManager::MaybeIncreaseLargestPeerStreamId to make it easier to read. Refactoring only, no functional change expected, not protected. PiperOrigin-RevId: 301870789 Change-Id: I2d9a2770f372f5c3bea52e2e4e59b157a27ed715