JavaScript: Consolidate stmts tests.

Author: Max Schaefer

javascript/ql/test/library-tests/stmts/Containers.expected

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+import javascript
+
+query predicate test_Containers(Stmt s, StmtContainer res) { res = s.getContainer() }

javascript/ql/test/library-tests/stmts/Containers.ql

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+import javascript
+
+query predicate test_DoubleColonMethods(ExprStmt e, Identifier interface, Identifier id, Function f) {
+  e.isDoubleColonMethod(interface, id, f)
+}

javascript/ql/test/library-tests/stmts/Containers.qll

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+import javascript
+
+query predicate test_EnclosingStmt(Expr e, Stmt res) { res = e.getEnclosingStmt() }