Cypress: enable Test Isolation

[alfonsomthd]

https://docs.cypress.io/app/core-concepts/test-isolation

Now after each test the session is cleared, hence the following refactoring:

• Login occurs in global beforeEach hook (and in before hooks where is required).
• Removed Logout as no longer necessary (and it's not part of any plugin).

[SanjalKatiyar]

/lgtm

[openshift-ci]

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