Treat HTTP/2 specific SETTING identifiers as errors in HTTP/3. This is specified in https://datatracker.ietf.org/doc/html/draft-ietf-quic-http-30#appendix-A.3 Protected by quic_reloadable_flag_quic_reject_spdy_settings. PiperOrigin-RevId: 333116208 Change-Id: I946f35ec70c490efb8ca10dbfb1bf9799240daf8