create e2e test for auth buttons (#1907)

This PR adds a few helpful additions regarding authentication.

Changes:
* e2e tests are now run on test_oauth via a passed config.yaml 
* node dev server correctly handles `/login` and `/logout` endpoints to make developing for auth easier
* Introduced auth e2e tests to check that buttons display and work

client/__tests__/e2e/e2e.test.js

@@ -17,6 +17,7 @@ import {
   goToPage,
   typeInto,
   waitByID,
+  clickOnUntil,
 } from "./puppeteerUtils";
 
 import {
@@ -521,6 +522,17 @@ test("lasso moves after pan", async () => {
   expect(panCount).toBe(initialCount);
 });
 
+describe("auth buttons", () => {
+  test("login then logout", async () => {
+    await goToPage(appUrlBase);
+    await clickOnUntil("log-in", async () => {
+      await page.waitForNavigation({ waitUntil: "networkidle0" });
+      await waitByID("user-info");
+    });
+    await logout();
+  });
+});
+
 const conditionalDescribe =
   process.env.TEST_AUTH_INTEGRATION === "true" ? describe : describe.skip;