gfe-relnote: (n/a) In quic_framer_process_data_packet_fuzzer, set framer's decrypter for INITIAL encryption level. Test only. This is needed to default enable --gfe2_reloadable_flag_quic_framer_doesnt_create_initial_encrypter in cl/275513312. PiperOrigin-RevId: 275528736 Change-Id: I943ff1a2775f690c9c8338ca00632191b0f0257d