CLEANUP: quic: rename TID affinity elements

CLEANUP: quic: rename TID affinity elements

This commit is the renaming counterpart of the previous one, this time
for quic_conn module. Several elements related to TID affinity update
from quic_conn has been renamed : public functions, but also flag
renamed to QUIC_FL_CONN_TID_REBIND and trace event to
QUIC_EV_CONN_BIND_TID.

This should be backported with the same instruction as the previous
commit.