h2olog: remove handling quicly:receive in gen_raw_tracer.py
h2olog: remove handling quicly:receive in gen_raw_tracer.py

because it conflicts with the appdata strategy. Instead,
quicly needs to add `uint8_t first_octet` explicitly

h2o/h2o,devnexen/h2o,h2o/h2o,cwyang/h2o,yannick/h2o,h2o/h2o,cwyang/h2o,h2o/h2o,yannick/h2o,cwyang/h2o,h2o/h2o,h2o/h2o,cwyang/h2o,h2o/h2o,devnexen/h2o,yannick/h2o,devnexen/h2o,devnexen/h2o,yannick/h2o,devnexen/h2o,yannick/h2o,cwyang/h2o,yannick/h2o,devnexen/h2o,yannick/h2o,devnexen/h2o,h2o/h2o,cwyang/h2o,devnexen/h2o,h2o/h2o,yannick/h2o,cwyang/h2o,yannick/h2o,cwyang/h2o,devnexen/h2o