Improve logging in QuicPacketCreator
Improve logging in QuicPacketCreator

Working on cl/368341433 was made harder by the fact that some of the logs didn't contain the ENDPOINT. This CL fixes that by making sure all packet creator logs contain it. This only impacts logging and is therefore not flag protected.

PiperOrigin-RevId: 368873837
Change-Id: I69fc1e6e6e2972a4105c3c9ecf3dbfcb5babaced

google/quiche,google/quiche,google/quiche,google/quiche