Support GOAWAY in HTTP/3. Currently the GOAWAY is used and sent in the same way as gQUIC GOAWAY does, which means the content of GOAWAY frame is not used. I will follow up with more CLs to implement the real IETF usage where stream larger than the goaway id is not allowed. gfe-relnote: protected by disabled v99 flag. PiperOrigin-RevId: 275339124 Change-Id: I082f579f501b534cce7ef2b83c94dee5a2091e85