[Bug fix] Use datadog.fullname to parametrize KPI configmap

[liliyadd]

What this PR does / why we need it:

BUG FIX

Use {{ template "datadog.fullname" . }} instead of {{ .Release.Name }} to parametrize the Configmap name

Which issue this PR fixes

#1293

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• Chart Version bumped
• Documentation has been updated with helm-docs (run: .github/helm-docs.sh)
• CHANGELOG.md has been updated
• Variables are documented in the README.md
• For Datadog Operator chart or value changes update the test baselines (run: make update-test-baselines)

[CharlyF]

rendered:

# Source: datadog/templates/kpi-telemetry-configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: orchexplorerdefault-datadog-kpi-telemetry-configmap
  namespace: default
  labels:
    helm.sh/chart: 'datadog-3.51.1'
    app.kubernetes.io/name: "orchexplorerdefault-datadog"
    app.kubernetes.io/instance: "orchexplorerdefault"
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/version: "7"
data:
  install_id: "62413100-xxx"
  install_type: k8s_manual
  install_time: "1705425730"