Correct Cypress message formatting for softAssert in headless mode

[MikeMcC399]

This PR resolves issue #3200 "Bad formatting in Cypress soft assertions headless error messages"

It corrects the tab and new line formatting characters in cypress/support/e2e.js used in headless mode.

Verification

Temporarily edit src/data/faq.json and introduce several errors such as removing target='_blank' from two links.

In one terminal execute
npm start

Once the localhost website is shown in a browser open a second terminal and execute
npx cypress run -s 'cypress/e2e/faq_link_attr.cy.js'

Check that the error message looks correctly formatted with each error starting on a separate line such as:

  1 failing

  1) Check attributes of FAQ links
       Check links are using _blank to open in new frame
         Test links for _blank presence:
     Error:
        AssertionError: http://localhost:8000/en/faq/results/#risk_encounter_no_warning in /en/faq/results/: expected '<a>' to have attribute 'target'
        AssertionError: http://localhost:8000/en/faq/results/#risk_encounter_different_devices in /en/faq/results/: expected '<a>' to have attribute 'target'
      at Context.eval (webpack:///./cypress/support/e2e.js:88:18)

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Internal Tracking ID: EXPOSUREAPP-14291

[larswmh]

Thanks for your bringing up this issue and providing a PR @MikeMcC399!