Cod Deployment to higher environments like UAT in Real-time

In real-time ,
How would the code deployment to Higher environments like UAT happen in a Cluster
I understand Production cluster will be Separate with restricted access. For the remaining test enviornments , How would one access the cluster for that specific test environment.
Can one access multiple clusters(for Dev,test environments) from a Gateway node? If so with what details?

Any information/ resources would help . Thankyou !

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