Fix unknown environment in Aiven credential creation

[rbjornstad]

What

• map user-facing environment names (for example dev-gcp) to cluster names before dynamic client lookup in aivencredentials getClient

Why

• fixes errors like: createOpenSearchCredentials unknown environment: dev-gcp
• applies to OpenSearch, Valkey and Kafka credential creation since they share the same getClient path

Verification

• go test ./internal/persistence/aivencredentials/... ./internal/graph/...

[Copilot]

Pull request overview

Updates Aiven credentials creation to select the correct Kubernetes dynamic client when the API receives a user-facing environment name that must be mapped back to a cluster name.

Changes:

• Use environmentmapper.ClusterName(environmentName) when looking up the dynamic Kubernetes client.
• Add the environmentmapper dependency to the Aiven credentials persistence layer.

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