test(masthead-v2): add e2e tests for masthead v2

[andy-blum]

Related Ticket(s)

Followup to #9570

This PR branches off of the above PR, and should not be added in first.

Description

• Duplicates & adapts the masthead (v1) e2e tests to cover masthead (v2).
• Adds a desktop/mobile test to check for Google Analytics attributes

Changelog

New

• Add masthead-v2 test coverage

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[RichKummer]

Hey Andy, I took a look at the Percy snapshot and it looks like the PR updated the type token for the menu headers. Sharing here so you can see:

[andy-blum]

@RichKummer Those changes are definitely not coming from this PR - we'll need to investigate where that's coming from, but those screenshots also don't match up with the V2 masthead data.