Introduce QUIC version T051

This version is a minor upgrade to T050 that brings in features that have been added to draft-27 and draft-29. This will allow us to remove multiple codepaths when we deprecate T050 and draft-25.

Introduce QUIC version T051, protected by gfe2_reloadable_flag_quic_enable_version_t051

PiperOrigin-RevId: 324040649
Change-Id: I3501bf03939f29bd17416510f43bc85d30832e29
diff --git a/quic/core/quic_version_manager.h b/quic/core/quic_version_manager.h
index 0360485..9eb69ed 100644
--- a/quic/core/quic_version_manager.h
+++ b/quic/core/quic_version_manager.h
@@ -58,10 +58,12 @@
   bool disable_version_draft_27_;
   // quic_disable_version_draft_25 flag
   bool disable_version_draft_25_;
-  // quic_disable_version_q050 flag
-  bool disable_version_q050_;
+  // quic_enable_version_t051 flag
+  bool enable_version_t051_;
   // quic_disable_version_t050 flag
   bool disable_version_t050_;
+  // quic_disable_version_q050 flag
+  bool disable_version_q050_;
   // quic_disable_version_q046 flag
   bool disable_version_q046_;
   // quic_disable_version_q043 flag