Add dataflow callback to filter out receiver argument flow to Golang interface dispatch candidates.

Other langauges stub the callback.

python/ql/lib/semmle/python/dataflow/new/internal/DataFlowDispatch.qll

@@ -1614,3 +1614,11 @@ private module OutNodes {
  * `kind`.
  */
 OutNode getAnOutNode(DataFlowCall call, ReturnKind kind) { call = result.getCall(kind) }
+
+/**
+ * Holds if flow from `call`'s argument `arg` to parameter `p` is permissible.
+ *
+ * This is a filter on top of the language-neutral argument/parameter matching implemented by `viableParamArg`.
+ */
+pragma[inline]
+predicate viableParamArgSpecific(DataFlowCall call, ParameterNode p, ArgumentNode arg) { any() }

python/ql/lib/semmle/python/dataflow/new/internal/DataFlowImplCommon.qll

@@ -425,7 +425,8 @@ private module Cached {
     exists(ParameterPosition ppos |
       viableParam(call, ppos, p) and
       argumentPositionMatch(call, arg, ppos) and
-      compatibleTypes(getNodeDataFlowType(arg), getNodeDataFlowType(p))
+      compatibleTypes(getNodeDataFlowType(arg), getNodeDataFlowType(p)) and
+      viableParamArgSpecific(call, p, arg)
     )
   }