Add -Winconsistent-missing-override to QUIC

This will avoid QUIC merge issues like the missing override in cl/253262405.

gfe-relnote: n/a, only adds compilation warning
PiperOrigin-RevId: 253317636
Change-Id: I818c59188f52eb0bb92d2a5df8ccd1509a1c9a67
diff --git a/quic/core/quic_connection_test.cc b/quic/core/quic_connection_test.cc
index f96a7e6..314898b 100644
--- a/quic/core/quic_connection_test.cc
+++ b/quic/core/quic_connection_test.cc
@@ -422,7 +422,7 @@
     return max_packet_size_;
   }
 
-  bool SupportsReleaseTime() const { return supports_release_time_; }
+  bool SupportsReleaseTime() const override { return supports_release_time_; }
 
   bool IsBatchMode() const override { return is_batch_mode_; }