Address review comment from Copilot: align mixed batch network type semconv

Author: trask

instrumentation/cassandra/cassandra-3.0/javaagent/src/test/java/io/opentelemetry/javaagent/instrumentation/cassandra/v3_0/CassandraClientTest.java

@@ -374,7 +374,7 @@ void batchStatementWithDifferentQueries() {
                         .hasKind(SpanKind.CLIENT)
                         .hasNoParent()
                         .hasAttributesSatisfyingExactly(
-                            equalTo(NETWORK_TYPE, "ipv4"),
+                            equalTo(NETWORK_TYPE, emitStableDatabaseSemconv() ? null : "ipv4"),
                             equalTo(SERVER_ADDRESS, cassandraHost),
                             equalTo(SERVER_PORT, cassandraPort),
                             equalTo(NETWORK_PEER_ADDRESS, cassandraIp),