Create npm workspace for E2E tests

[benbowler]

Summary

Addresses issue:

• Move js dependencies required for E2E tests into their own workspace #10013

Relevant technical choices

puppeteer and puppeteer-core are used in storybook tests currently, we should remove these from the main package.json as part of #10091.

PR Author Checklist

• My code is tested and passes existing unit tests.
• My code has an appropriate set of unit tests which all pass.
• My code is backward-compatible with WordPress 5.2 and PHP 7.4.
• My code follows the WordPress coding standards.
• My code has proper inline documentation.
• I have added a QA Brief on the issue linked above.
• I have signed the Contributor License Agreement (see https://cla.developers.google.com/).

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Code Reviewer Checklist

• Run the code.
• Ensure the acceptance criteria are satisfied.
• Reassess the implementation with the IB.
• Ensure no unrelated changes are included.
• Ensure CI checks pass.
• Check Storybook where applicable.
• Ensure there is a QA Brief.
• Ensure there are no unexpected significant changes to file sizes.

Merge Reviewer Checklist

• Ensure the PR has the correct target branch.
• Double-check that the PR is okay to be merged.
• Ensure the corresponding issue has a ZenHub release assigned.
• Add a changelog message to the issue.

[github-actions]

Build files for 60b77c2 are ready:

• Download development build
• Download production build

[benbowler]

Note the one failing E2E test will be fixed in #10111

[eugene-manuilov]

Thanks, @benbowler. Nice work, but we need to move more dependencies. Please, see my comments.

[eugene-manuilov]

We need to define all dependencies that are used by e2e tests here, even if they are still used by other parts as well, in which case we shouldn't remove them from the main package.json.

Here is the full list of dependencies that should be here:

{
	"dependencies": {
		"@wordpress/babel-preset-default": "^4.20.0",
		"@wordpress/e2e-test-utils": "^4.16.1",
		"@wordpress/jest-console": "^3.10.0",
		"amphtml-validator": "^1.0.38",
		"babel-jest": "^26.6.3",
		"dockerode": "^4.0.2",
		"expect-puppeteer": "^4.4.0",
		"jest": "^26.6.3",
		"jest-puppeteer": "^4.4.0",
		"jsdom": "^16.7.0",
		"puppeteer": "^10.4.0"
	}
}

[eugene-manuilov]

This is not needed, we can remove it.

Suggested change

	"name": "googlesitekit-e2e",
	"description": "E2E testing infrastructure for Google Site Kit",
	"main": "script.js",
	"private": true,

[eugene-manuilov]

Same, not needed.

Suggested change

	"repository": {
	"type": "git",
	"url": "git+https://github.com/google/site-kit-wp.git"
	},
	"author": "Google",
	"license": "Apache-2.0",
	"bugs": {
	"url": "https://github.com/google/site-kit-wp/issues"
	},
	"homepage": "https://github.com/google/site-kit-wp#readme"

[eugene-manuilov]

Maybe we should also move local-env files into the tests/e2e folder? We don't use it anywhere else, right?