refactor: shorten cluster/release names + fix ExternalSecret key fmt

[jonathandieu]

• Rename clusters/dieubernetes-platform-do-atl1 to clusters/platform-do-atl1 to match the ArgoCD cluster secret
• Set releaseName: "{{ .app }}" in the infrastructure AppSet so Helm releases use short names instead of the overly verbose full Application name, avoiding the 63-char label limit that was breaking the envoy-gateway certgen Job.
• Fix ExternalSecret remoteRef keys: onepasswordSDK expects item-uuid/field format, not plain item names or op:// URIs.

[Copilot]

Pull request overview

This PR updates the infrastructure deployment configuration to use shorter, more consistent cluster/release naming and aligns ExternalSecret remoteRef key formatting with the OnePassword SDK provider expectations.

Changes:

• Shorten the platform-do-atl1 cluster name to match the ArgoCD cluster secret naming.
• Configure ArgoCD ApplicationSet Helm releases to use shorter release names.
• Update ExternalSecret remoteRef.key values to use the OnePassword SDK item-id/field format, and add cluster-specific overrides for metrics-server and envoy-gateway.

Reviewed changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
clusters/platform-do-atl1/overrides/metrics-server.yaml	Adds a DOKS-specific metrics-server arg override to allow scraping kubelets with self-signed certs.
clusters/platform-do-atl1/overrides/envoy-gateway.yaml	Adds a per-cluster DigitalOcean load balancer adoption annotation for Envoy Gateway’s service.
clusters/platform-do-atl1/cluster.yaml	Renames the cluster to a shorter, ArgoCD-aligned name (platform-do-atl1).
charts/infrastructure/kube-prometheus-stack/templates/grafana-cloud-credentials.yaml	Updates OnePassword-backed ExternalSecret keys to item-id/field format for Grafana Cloud creds.
charts/infrastructure/external-dns/templates/cloudflare-token.yaml	Updates OnePassword-backed ExternalSecret key to item-id/field format for the Cloudflare token.
argocd/apps/infrastructure/appset.yaml	Sets a Helm releaseName for ApplicationSet-rendered infrastructure charts (shortening rendered resource names).

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