Remove Cypress login hacks

We previously had a lil trick to help Cypress perform an Auth0 login without using the whole Auth0 UI. (I forget exactly why!)

With Cypress deleted, we don't need this code anymore!

src/app/apolloClient.js

@@ -3,10 +3,7 @@ import { setContext } from "@apollo/client/link/context";
 import { createPersistedQueryLink } from "apollo-link-persisted-queries";
 
 import cachedZones from "./cached-data/zones.json";
-import {
-  getAuthModeFeatureFlag,
-  readCypressLoginData,
-} from "./components/useCurrentUser";
+import { getAuthModeFeatureFlag } from "./components/useCurrentUser";
 
 // Teach Apollo to load certain fields from the cache, to avoid extra network
 // requests. This happens a lot - e.g. reusing data from item search on the
@@ -192,13 +189,7 @@ const authModeLink = setContext((_, { headers = {} }) => {
 });
 
 async function getAccessToken(getAuth0) {
-  // Our Cypress tests store login data separately. Use it if available!
-  const cypressToken = readCypressLoginData()?.encodedToken;
-  if (cypressToken) {
-    return cypressToken;
-  }
-
-  // Otherwise, wait for auth0 to stop loading, so we can maybe get a token!
+  // Wait for auth0 to stop loading, so we can maybe get a token!
   // We'll do this hackily by checking every 100ms until it's true.
   await new Promise((resolve) => {
     function check() {

src/app/components/useCurrentUser.js

@@ -40,17 +40,6 @@ function useCurrentUser() {
     };
   }
 
-  // Additionally, our Cypress tests do an actual end-to-end login as a test
-  // user. Use that token if present!
-  const cypressUser = readCypressLoginData()?.decodedUser;
-  if (cypressUser) {
-    return {
-      isLoading: false,
-      isLoggedIn: true,
-      ...getUserInfoFromAuth0Data(cypressUser),
-    };
-  }
-
   if (authMode === "auth0") {
     return currentUserViaAuth0;
   } else if (authMode === "db") {
@@ -133,22 +122,6 @@ function useCurrentUserViaDb({ isEnabled }) {
   }
 }
 
-export function readCypressLoginData() {
-  const cypressUserJsonString = window.localStorage.getItem("auth0Cypress");
-  if (!cypressUserJsonString) {
-    return null;
-  }
-
-  try {
-    return JSON.parse(cypressUserJsonString);
-  } catch (e) {
-    console.warn(
-      "Could not parse auth0Cypress token in localStorage; ignoring."
-    );
-    return null;
-  }
-}
-
 function getUserInfoFromAuth0Data(user) {
   return {
     id: user.sub?.match(/^auth0\|impress-([0-9]+)$/)?.[1],