C#: Exclude non source parameters from arguments test cases (otherwise the test reports indexer access and calls to Add for list and collection creations).

Author: michaelnebel

csharp/ql/test/library-tests/arguments/argumentByParameter.ql

@@ -1,5 +1,7 @@
 import csharp
 
 from Call call, Expr arg, Parameter param
-where arg = call.getArgumentForParameter(param)
+where
+  arg = call.getArgumentForParameter(param) and
+  call.getTarget().fromSource()
 select call, arg, param

csharp/ql/test/library-tests/arguments/parameterGetArguments.ql

@@ -1,4 +1,5 @@
 import csharp
 
 from Parameter param
+where param.getCallable().fromSource()
 select param, param.getAnAssignedArgument()