Use QUIC v47 for variable length connection IDs instead of CRYPTO frames

This CL takes over v47 to not be related to CRYPTO frames any more but instead support for variable length connection IDs. CRYPTO frames will be given v48 in a followup CL.

gfe-relnote: v47-specific change, protected by gfe2_reloadable_flag_quic_enable_version_47
PiperOrigin-RevId: 239634999
Change-Id: Ie274fb5b5e1536e05fe1c2056b1825b2cdc09642
diff --git a/quic/core/quic_utils.cc b/quic/core/quic_utils.cc
index d03cc0e..d12ebeb 100644
--- a/quic/core/quic_utils.cc
+++ b/quic/core/quic_utils.cc
@@ -493,7 +493,7 @@
 // static
 bool QuicUtils::VariableLengthConnectionIdAllowedForVersion(
     QuicTransportVersion version) {
-  return version == QUIC_VERSION_99;
+  return version >= QUIC_VERSION_47;
 }
 
 // static