Add `cy.press()` to examples

[MikeMcC399]

What would you like?

Add the API command cy.press() to examples in

• cypress/e2e/2-advanced-examples and to
• app/commands source for publication to https://example.cypress.io/

Why is this needed?

The API command cy.press() was introduced with cypress@14.3.0 and it is not demonstrated in this repo, although the related API command cy.type() is demonstrated.