Added initial webdriver tests (#1337)

Adds webdriver tests for testing from a users perspective via browser
actions. We currently support local test runners for a bunch of actions
on desktop `chrome`/`firefox`/`edge`/`safari` on macos.

We also have a browserstack runner which we'll enable in another PR.

### Release Note

- Adds initial webdriver tests

scripts/e2e-start-server

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+set -eux
+yarn dev-webdriver