Request copy assignment operator. (#18865)

The copy assignment operator is being invoked for SocketOptionName implicitly. Explicitly request it.

This fixes compiling with clang-14.

Signed-off-by: Kevin Baichoo <kbaichoo@google.com>

envoy/network/socket.h

@@ -24,6 +24,7 @@ namespace Network {
 struct SocketOptionName {
   SocketOptionName() = default;
   SocketOptionName(const SocketOptionName&) = default;
+  SocketOptionName& operator=(const SocketOptionName&) = default;
   SocketOptionName(int level, int option, const std::string& name)
       : value_(std::make_tuple(level, option, name)) {}