[Cilium v1.19] fix: adapt operator, Helm, tests for v1.19

[nddq]

Summary

Part 7 of the Cilium v1.19 upgrade (#1788).

Operator CRD registration, endpoint/identity controllers, Helm charts (enableDNSParsing), remaining test utilities.

Files (~27):

• operator/cilium-crds/k8s/apis/cell.go, operator/cilium-crds/k8s/apis/register.go, operator/cilium-crds/k8s/resource_ctors.go, operator/cilium-crds/k8s/resources.go
• operator/cmd/cilium-crds/cells_linux.go, operator/cmd/cilium-crds/flags.go, operator/cmd/cilium-crds/root_linux.go, operator/cmd/cilium-crds/zap_linux.go
• operator/cmd/cilium_crds_cmd_linux.go, operator/cmd/standard/deployment.go
• pkg/controllers/operator/cilium-crds/endpoint/endpoint_controller_linux.go, pkg/controllers/operator/cilium-crds/endpoint/endpoint_controller_linux_test.go
• pkg/controllers/operator/cilium-crds/endpoint/identitymanager_linux.go, pkg/controllers/operator/cilium-crds/endpoint/identitymanager_linux_test.go
• pkg/controllers/operator/retinaendpoint/retinaendpoint_controller_test.go
• pkg/utils/testutil/cilium/endpoint_client.go, pkg/utils/testutil/cilium/identity_client.go, pkg/utils/testutil/cilium/resource.go, pkg/utils/testutil/cilium/versioned_client.go
• deploy/hubble/manifests/controller/helm/retina/templates/agent/configmap.yaml, deploy/hubble/manifests/controller/helm/retina/templates/agent/daemonset.yaml, deploy/hubble/manifests/controller/helm/retina/values.yaml
• deploy/standard/manifests/controller/helm/retina/templates/configmap.yaml, deploy/standard/manifests/controller/helm/retina/values.yaml
• test/managers/filtermanager/main.go, test/plugin/infiniband/main_linux.go, test/plugin/linuxutil/main_linux.go, test/plugin/packetforward/main_linux.go
• test/e2e/framework/prometheus/prometheus.go

Estimated size: ~550 lines

Depends on: #2037
Parent issue: #1788