Replace Cypress.env() with gluon 9.8

Big Bang Gluon 9.8 is in process of being released, as part of that release Cypress.eng() is being deprecated. This updates us to cypress 15.10.0

Please use:

Use cy.env() for sensitive values that should remain outside the browser
Use Cypress.expose() for values that are intentionally safe to expose

See documentation: https://www.cypress.io/blog/environment-variable-access-in-cypress-v15-10-0-migrating-to-cy-env-and-cypress-expose.