Document configuring workload identities with Scylla Manager Agent

[rzetelskik]

What should the feature do?

We should document how to enable and configure IAM roles for use with ScyllaClusters' service accounts in supported manged K8s services (EKS and GKE).

What is the use case behind this feature?

Granting access to object storage for Scylla Manager Agent containers.

Anything else we need to know?

Refs:

• https://cloud.google.com/kubernetes-engine/docs/how-to/workload-identity
• https://docs.aws.amazon.com/eks/latest/userguide/associate-service-account-role.html

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/lifecycle stale

[tnozicka]

/remove-lifecycle stale /triage accepted