Add feature for disabling connection string login and enable this for aad redirect. (#1660)

* Add redirect for /aad to /?feature.enableAadDataPlane=true

* Add feature to hide the connection string login link. Enable this new
feature for the aad redirect.

src/Platform/Hosted/Components/ConnectExplorer.test.tsx

@@ -1,6 +1,8 @@
 jest.mock("../../../hooks/useDirectories");
 import "@testing-library/jest-dom";
 import { fireEvent, render, screen } from "@testing-library/react";
+import { extractFeatures } from "Platform/Hosted/extractFeatures";
+import { updateUserContext, userContext } from "UserContext";
 import React from "react";
 import { ConnectExplorer } from "./ConnectExplorer";
 
@@ -16,3 +18,24 @@ it("shows the connect form", () => {
   fireEvent.click(screen.getByText("Connect to your account with connection string"));
   expect(screen.queryByPlaceholderText("Please enter a connection string")).toBeDefined();
 });
+
+it("hides the connection string link when feature.disableConnectionStringLogin is true", () => {
+  const connectionString = "fakeConnectionString";
+  const login = jest.fn();
+  const setConnectionString = jest.fn();
+  const setEncryptedToken = jest.fn();
+  const setAuthType = jest.fn();
+  const oldFeatures = userContext.features;
+
+  const params = new URLSearchParams({
+    "feature.disableConnectionStringLogin": "true",
+  });
+
+  const testFeatures = extractFeatures(params);
+  updateUserContext({ features: testFeatures });
+
+  render(<ConnectExplorer {...{ login, setEncryptedToken, setAuthType, connectionString, setConnectionString }} />);
+  expect(screen.queryByPlaceholderText("Connect to your account with connection string")).toBeNull();
+
+  updateUserContext({ features: oldFeatures });
+});