ci: remove windows2019 from release test pipeline

.pipelines/cni/pipeline.yaml

@@ -213,22 +213,6 @@ stages:
  scaleup: ${SCALEUP_WIN}
  iterations: ${ITERATIONS_WIN}
 
- - template: singletenancy/cniv2-template.yaml
- parameters:
- name: windows19_overlay
- clusterType: overlay-byocni-up
- clusterName: w19-amd-ov
- nodeCount: ${NODE_COUNT_WINCLUSTER_SYSTEMPOOL}
- nodeCountWin: ${NODE_COUNT_WIN}
- vmSize: ${VM_SIZE_WINCLUSTER_SYSTEMPOOL}
- vmSizeWin: ${VM_SIZE_WIN}
- arch: amd64
- os: windows
- os_version: 'ltsc2019'
- osSkuWin: 'Windows2019'
- scaleup: ${SCALEUP_WIN}
- iterations: ${ITERATIONS_WIN}
-
 ## Linux E2E
  - template: singletenancy/cniv1-template.yaml
  parameters:
@@ -547,7 +531,6 @@ stages:
  - rdma_linux_overlay
  - windows_podsubnet_HNS
  - windows_overlay_HNS
- - windows19_overlay_HNS
  - setup
  - ${{if eq(parameters.upgradeScenario, true)}}:
  - cilium_overlay_upgrade
@@ -622,9 +605,6 @@ stages:
  win-cniv2-overlay:
  name: windows_overlay
  clusterName: w22-over
- windows19_overlay:
- name: windows19_overlay
- clusterName: w19-amd-ov
  steps:
  - task: AzureCLI@2
  inputs: