Better randomization in StreamsMetadataTests (elastic#142255)

This beefs up the randomization to follow the common pattern in the codebase.

Relates to elastic#141564 and elastic#142171

Author: dakrone

server/src/test/java/org/elasticsearch/cluster/metadata/StreamsMetadataTests.java

@@ -33,6 +33,11 @@ protected StreamsMetadata createTestInstance() {
 
     @Override
     protected StreamsMetadata mutateInstance(StreamsMetadata instance) throws IOException {
-        return new StreamsMetadata(instance.logsEnabled == false, instance.logsECSEnabled == false, instance.logsOTelEnabled == false);
+        return switch (between(0, 2)) {
+            case 0 -> new StreamsMetadata(instance.logsEnabled == false, instance.logsECSEnabled, instance.logsOTelEnabled);
+            case 1 -> new StreamsMetadata(instance.logsEnabled, instance.logsECSEnabled == false, instance.logsOTelEnabled);
+            case 2 -> new StreamsMetadata(instance.logsEnabled, instance.logsECSEnabled, instance.logsOTelEnabled == false);
+            default -> throw new IllegalArgumentException("Illegal randomisation branch");
+        };
     }
 }