C#: Add kind tag to Capture model queries.

csharp/ql/src/utils/model-generator/CaptureSinkModels.ql

@@ -1,6 +1,7 @@
 /**
  * @name Capture sink models.
  * @description Finds public methods that act as sinks as they flow into a a known sink.
+ * @kind diagnostic
  * @id cs/utils/model-generator/sink-models
  */
 

csharp/ql/src/utils/model-generator/CaptureSourceModels.ql

@@ -1,6 +1,7 @@
 /**
  * @name Capture source models.
  * @description Finds APIs that act as sources as they expose already known sources.
+ * @kind diagnostic
  * @id cs/utils/model-generator/source-models
  */
 

csharp/ql/src/utils/model-generator/CaptureSummaryModels.ql

@@ -1,6 +1,7 @@
 /**
  * @name Capture summary models.
  * @description Finds applicable summary models to be used by other queries.
+ * @kind diagnostic
  * @id cs/utils/model-generator/summary-models
  */