Fix the integration tests. (#4084)

* Fix logging/alerts during OIDC cancellation.

- Cancelling from within the web view wasn't being handled since moving the UserIndicatorController into the presenter.
- The WAS canceledLogin error code is also used when the system cancels the login. When the system cancels there's a failure reason included in the error.

* Allow UI tests to tap on any point within a view.

* Make the homeserver optional in integration tests.

* Dismiss the keyboard after entering a username to reveal the password text field.

Do the same after entering the password field too, just in case.

* Add a loop while waiting for the WAS prompt to be shown.

IntegrationTests/Sources/Application.swift

@@ -23,10 +23,10 @@ enum Application {
 }
 
 extension XCUIApplication {
-    var homeserver: String {
+    var homeserver: String? {
         guard let homeserver = ProcessInfo.processInfo.environment["INTEGRATION_TESTS_HOST"],
               homeserver.count > 0 else {
-            return "default"
+            return nil
         }
         
         return homeserver