Spike AXE A11Y testing in Cypress (#9111)

* Spike AXE A11Y testing in Cypress

* Fix NewRoomIntro breaking html/aria list rules

* Fix HeaderButtons breaking aria role semantics rules

* missing type

* Switch left panel from aside to nav and include space panel

* Give the page a main heading of the room name when viewing a room

* Use header landmark on RoomHeader

* Improve aria attributes on composer when autocomplete is closed

* Fix aria-owns on RoomHeader

* Give Spinner an aria role

* Give server picker help button an aria label

* Improve auth aria attributes and semantics

* Improve heading semantics in use case selection screen

* Fix autocomplete attribute to be valid

* Fix heading semantics on login page

* Improve Cypress axe testing

* Add axe tests

* Stop synapse after the timeline tests

* Await spinners to fade before percy snapshotting timeline tests

* Improve naming of plugin

* Update snapshots

* Fix accidental heading change

* Fix double synapse stoppage

* Fix Cypress timeline avatar assertions to be DPI agnostic

* Fix aria attributes on date separators

* delint

* Update snapshots

* Revert style change

* Skip redundant call

cypress/plugins/index.ts

@@ -22,6 +22,7 @@ import { performance } from "./performance";
 import { synapseDocker } from "./synapsedocker";
 import { webserver } from "./webserver";
 import { docker } from "./docker";
+import { log } from "./log";
 
 /**
  * @type {Cypress.PluginConfig}
@@ -31,4 +32,5 @@ export default function(on: PluginEvents, config: PluginConfigOptions) {
     performance(on, config);
     synapseDocker(on, config);
     webserver(on, config);
+    log(on, config);
 }