gfe-relnote: Deprecate gfe2_reloadable_flag_quic_enable_lifo_write_scheduler.
gfe-relnote: Deprecate gfe2_reloadable_flag_quic_enable_lifo_write_scheduler.

PiperOrigin-RevId: 292379022
Change-Id: I9e5d72e2fdd0ca9c8a338c302615a3528eecdf28

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