Rename all JSX files to have proper file extension

Change-Id: I4ab382f7673a815164f74154e6b03b370fd76a33

src/components/LoginPage.test.jsx

@@ -0,0 +1,14 @@
+import React from "react";
+import { render } from "@testing-library/react";
+import { AdminContext } from "react-admin";
+import LoginPage from "./LoginPage";
+
+describe("LoginForm", () => {
+  it("renders", () => {
+    render(
+      <AdminContext>
+        <LoginPage />
+      </AdminContext>
+    );
+  });
+});