Replace enable flags for draft-25 and draft-27 with disable flags

draft-27 is currently blocked because we're going to support it for a while. draft-25 is unblocked, as we're going to remove this version entirely soon.

Deprecate gfe2_reloadable_flag_quic_enable_version_draft_25_v3 and gfe2_reloadable_flag_quic_enable_version_draft_27, introduce gfe2_reloadable_flag_quic_disable_version_draft_25 and gfe2_reloadable_flag_quic_disable_version_draft_27

PiperOrigin-RevId: 316667223
Change-Id: I5584b5ceeb392d0d12fd744ad8c8ce4863c70880
diff --git a/quic/core/quic_version_manager.h b/quic/core/quic_version_manager.h
index 1375995..6bdf2d3 100644
--- a/quic/core/quic_version_manager.h
+++ b/quic/core/quic_version_manager.h
@@ -56,10 +56,10 @@
   bool enable_version_draft_29_;
   // quic_enable_version_draft_28 flag
   bool enable_version_draft_28_;
-  // quic_enable_version_draft_27 flag
-  bool enable_version_draft_27_;
-  // quic_enable_version_draft_25_v3 flag
-  bool enable_version_draft_25_;
+  // quic_disable_version_draft_27 flag
+  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_disable_version_t050 flag