[Tests] Add Cypress tests for downloading eAPD docs

[thetif]

Description and related issues

We need an e2e test to check our doc functionality. Here is a write up for how to test it: https://filiphric.com/testing-pdf-file-with-cypress It is not necessary to test the contents of the pdfs

Acceptance criteria

• [ ] e2e coverage for documents has been added

Testing criteria

Given	When	Then	Covered
the login page	user clicks the How to get Started link	a pdf downloads
the login page	user clicks the How to Access the eAPD	a pdf downloads
the login page	user clicks the State Administrator Authorization Form	a pdf downloads