Add SEQUENTIAL ID strategy for deterministic flake reproduction

Use SEQUENTIAL id.generation.strategy in the DSM-disabled Kafka test to
force a deterministic sort order for SORT_TRACES_BY_ID. Sequential IDs
sort traces in creation order, which differs from the reverse mapping
the original positional code assumed. This proves the dynamic parent
lookup fix handles any trace ordering.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bm1549

dd-java-agent/instrumentation/kafka/kafka-clients-0.11/src/test/groovy/KafkaClientTestBase.groovy

@@ -1481,6 +1481,10 @@ class KafkaClientDataStreamsDisabledForkedTest extends KafkaClientTestBase {
     super.configurePreAgent()
     injectSysConfig("dd.service", "KafkaClientDataStreamsDisabledForkedTest")
     injectSysConfig("dd.kafka.legacy.tracing.enabled", "true")
+    // Deterministic reproduction: SEQUENTIAL ID strategy forces a known sort order
+    // that differs from the reverse order the original positional code assumed,
+    // proving the dynamic parent lookup fix handles any ordering.
+    injectSysConfig("id.generation.strategy", "SEQUENTIAL")
   }
 
   @Override