chore(cypress): update cypress tests to handle pf6 elements

[aptmac]

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Fixes: #908

Description of the change:

Updates the Cypress tests to check for PF6 elements.

Also clicks off the guided tour that was added in 4.19.

Motivation for the change:

Lets the Cypress tests run again, useful for testing PRs such as #895

How to manually test:

1. yarn run start-console, yarn run start, and have a Cryostat installed plus some target
2. yarn run cypress:headed or yarn run cypress:headless

[andrewazores]

Seems to be partially failing for me in its current state, but it's also possible I just don't have everything set up quite right:

  Running:  dashboard-page.cy.ts                                                            (2 of 2)


  Dashboard page tests
    ✓ should have the url /cryostat/
    1) should refresh the metrics charts after 10 seconds
    2) should refresh the d-solo charts after 10 seconds


  1 passing (2m)
  2 failing

  1) Dashboard page tests
       should refresh the metrics charts after 10 seconds:
     AssertionError: Timed out retrying after 30000ms: Expected to find element: `button[tabindex="0"]`, but never found it. Queried from:

              > cy.get(div[data-ouia-component-type="PF6/Dropdown"])
      at Context.eval (webpack:///./tests/dashboard-page.cy.ts:52:7)

  2) Dashboard page tests
       should refresh the d-solo charts after 10 seconds:
     AssertionError: Timed out retrying after 30000ms: Expected to find element: `button[tabindex="0"]`, but never found it. Queried from:

              > cy.get(div[data-ouia-component-type="PF6/Dropdown"])
      at Context.eval (webpack:///./tests/dashboard-page.cy.ts:71:7)