refactor(dashboard): update kustomize manifests structure as per notebooks v2

[alokdangre]

• Move common labels to components/common
• Move network-policy to istio component
• Use envFrom with configMapRef in deployment
• Move sidecar injection to istio patch
• Move replacements to overlays
• Enable nameSuffixHash for ConfigMaps

related: #180

Directory Structure

kustomize/
├── base/
│ ├── clusterrole-binding.yaml
│ ├── clusterrole.yaml
│ ├── configmap.yaml
│ ├── deployment.yaml
│ ├── kustomization.yaml
│ ├── params.env
│ ├── role-binding.yaml
│ ├── role.yaml
│ ├── service-account.yaml
│ └── service.yaml
├── components/
│ ├── common/
│ │ └── kustomization.yaml # NEW: Contains all labels
│ └── istio/
│ ├── authorizationpolicy.yaml
│ ├── kustomization.yaml # Updated: sidecar patch, network-policy
│ ├── network-policy.yaml # MOVED from base
│ └── virtual-service.yaml
└── overlays/
├── istio/
│ └── kustomization.yaml # Updated: has all replacements
└── kserve/
├── kustomization.yaml # Updated: has all replacements
└── patches/
└── configmap.yaml

[google-oss-prow]

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