Add ability to run cypress test

[sndrs]

What are you changing?

• renames existing e2e functionality (i.e. running unit tests against built packages) to verify-dist
• adds cypress testing capabilities and runs it as e2e target

Why?

• needed for Move CMP to @guardian/libs #1128

Currently this is just a placeholder test in libs. Closes #1170.

cc @guardian/transparency-consent

[changeset-bot]

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Latest commit: 3d82a66

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[github-actions]

Tip

Once this PR is ready to go, add the run_chromatic label to run the Chromatic tests.

This saves us a lot of money by not running the tests before we need them.