[E2E] Overload the existing E2E `visitDashboard` helper to make it work with the alias (#38309)

* Add `visitDashboardAlias` E2E helper

* Overload `visitDashboard` helper

It should work with either dashboard id, or with a dashboard id alias.

* PoC: Use overloaded `visitDashboard` helper

* Update even more tests with the overloaded `visitDashboard` helper

* Use `cy.visit` for tests with `cy.clock` instead of a custom helper

* Rename non-exported functions