Disable gfe2_restart_flag_quic_default_on_ietf_loss_detection in QuicEndpointTest.Competition while investigating the issue.
Disable gfe2_restart_flag_quic_default_on_ietf_loss_detection in QuicEndpointTest.Competition while investigating the issue.

gfe-relnote: n/a(test only change)
PiperOrigin-RevId: 290807785
Change-Id: Ia97e44050f936d3d7dd9fe173a9b747f170f561b

google/quiche,google/quiche,google/quiche,google/quiche