gfe-relnote: In QUIC, only do minimum validation of coalesced packets (only validate connection IDs). Protected by gfe2_reloadable_flag_quic_minimum_validation_of_coalesced_packets. Also do not consider unprocessable coalesced packet as QUIC_PEER_BUG, because garbage content could be padding outside QUIC packet.. PiperOrigin-RevId: 297414444 Change-Id: Ifc6359e62a561746012fc718aaf24a821a7cfedf