PS: Add test for forEach.

Author: MathiasVP

powershell/ql/test/library-tests/controlflow/elements.expected

@@ -0,0 +1,9 @@
+import semmle.code.powershell.controlflow.CfgNodes
+import ExprNodes
+import StmtNodes
+
+query predicate forEach(ForEachStmtCfgNode forEach, ExprCfgNode va, ExprCfgNode iterable, StmtCfgNode body) {
+  va = forEach.getVarAccess() and
+  iterable = forEach.getIterableExpr() and
+  body = forEach.getBody()
+}