REFACTOR(otel): migrate collector from Operator to Helm

- Remove opentelemetry-operator (no longer needed)
- Convert opentelemetry-collector to direct Helm Chart
- Remove CRD-based manifests (collector.yaml, rbac.yaml)
- Update helm-values.yaml with Loki labels and env vars
- Simplify architecture: Helm -> DaemonSet (no Operator)

kustomization.yaml

@@ -12,7 +12,6 @@ resources:
   - loki/argocd.yaml
   # promtail removed - OTel filelog receiver handles log collection
   - tempo/argocd.yaml
-  - opentelemetry-operator/argocd.yaml
   - opentelemetry-collector/argocd.yaml
   - node-exporter/argocd.yaml
   - kube-state-metrics/argocd.yaml