Refactor out header checks in homepage E2E tests

[dgodongm]

Description

Created validateHeader util module with helper methods similar to validateFooter, and updated homepage E2E tests to use these, adding distinct test for mobile as well.

Related Issue

#121 - provides some E2E coverage instead of component as it seems there's technical impediment for the latter - see comments in this issue

Motivation and Context

Ensure more consistent approach between footer and header checks. And, adding some coverage for modal menu on mobile.

How Has This Been Tested?

Tested locally on Chrome

Screenshots (if appropriate):

n/a

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[dgodongm]

@chadstewart @marktnoonan What do you think of this refactoring, and additional mobile test?

[marktnoonan]

This looks great, nice to capture mobile and since everything is the same it makes perfect sense to pull the repeated code into a helper function.

Also there's a good point raised about component testing and the latest version of next, let's not sink too much time into solving those issues right away if the same tests will work fine from e2e.

[dgodongm]

Thanks @marktnoonan! @chadstewart - any feedback or are you good with merging?

[dgodongm]

@chadstewart @marktnoonan Can this be merged?

[marktnoonan]

@chadstewart this needs you to authorize the Vercel step. Or I can merge without that since it's just tests.

[dgodongm]

@chadstewart Friendly ping on this PR