Apply PageObject pattern Clusters Overview tests.

[vicenteqa]

Description

Apply page object pattern to clusters overview tests
Key points:

• Some methods from commands file have been removed and now they are in po files
• Skipped & WIP test has been refactored but still left as WIP as the scope of this task was different

Bonus track:

• I removed a couple of unused parameters in visit methods from two page objects as required by @nelsonkopliku in a previus pr review
• I also removed a validation that was done with data-testid for consistency and to end up not using them after the refactor finishes.

No changes required in docs.

Fixes # (issue)

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• DONE

How was this tested?

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• DONE

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• Manual installation guide
• Trento Ansible guide
• Trento Web guides

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• DONE