LibJS: Convert remaining top-level tests to new system

Author: https://github.com/mattco98
Commit: 918f4affd5
Pull-request: https://github.com/SerenityOS/serenity/pull/2689
Reviewed-by: https://github.com/linusg

Libraries/LibJS/Tests/strict-mode-errors.js

@@ -1,21 +1,9 @@
 "use strict";
 
-load("test-common.js");
-
-try {
+test("basic functionality", () => {
   [true, false, "foo", 123].forEach(primitive => {
-    assertThrowsError(
-      () => {
-        primitive.foo = "bar";
-      },
-      {
-        error: TypeError,
-        message: "Cannot assign property foo to primitive value",
-      }
-    );
+    expect(() => {
+      primitive.foo = "bar";
+    }).toThrowWithMessage(TypeError, "Cannot assign property foo to primitive value");
   });
-
-  console.log("PASS");
-} catch (e) {
-  console.log("FAIL: " + e);
-}
+});