Adds CI for webdriver tests (#1343)

Github action CI workflows added for webdriver tests.

I've also refactored the `./scripts/e2e-*` scripts. These scripts were
somewhat unique compared to the other scripts. They are now more inline
with the other scripts in that directory and run via

```
% yarn e2e --help                               
Usage: yarn e2e <command> [options]

Commands:
  yarn e2e serve              start test server
  yarn e2e test:ci [env]      runner for CI (github-actions)
  yarn e2e test:local         run webdriver tests locally
  yarn e2e test:browserstack  run webdriver tests on browserstack
  yarn e2e selenium:grid      start selenium grid (test linux)

Options:
  --help     Show help                                                 [boolean]
  --version  Show version number                                       [boolean]
``` 

I've also added an experimental linux runner see 


2cca4ddb77/e2e/README.md (L320-L333)

### Change Type

- [x] `tests` — Changes to any testing-related code only (will not
publish a new version)


### Release Notes

- Github action CI workflows added for webdriver tests
- Refactored e2e test runner

scripts/e2e/commands/selenium-grid.ts

@@ -0,0 +1,36 @@
+import { promiseSpawn } from './util'
+
+export default async function seleniumGrid() {
+	// NOTE: This should work on non-macos, but it's only be tested on macos with M1 chipset
+	const command = 'docker'
+	let args: string[] = []
+	if (process.arch === 'arm64') {
+		args = [
+			`run`,
+			`-t`,
+			`--platform`,
+			`linux/amd64`,
+			`-p`,
+			`4444:4444`,
+			`-p`,
+			`7900:7900`,
+			`--shm-size=2g`,
+			`seleniarm/standalone-firefox:latest`,
+		]
+	} else {
+		args = [
+			'run',
+			'-t',
+			'-p',
+			'4444:4444',
+			'-p',
+			'7900:7900',
+			`--shm-size=2g`,
+			`selenium/standalone-firefox:latest`,
+		]
+	}
+
+	return promiseSpawn(command, args, {
+		stdio: [0, 0, 0], // Use parent's [stdin, stdout, stderr]
+	})
+}