[enhancement]: Allow configure Kubernetes@x task output as secret

[coy2k]

Task name

Kubernetes@x

Describe your feature request here

It would be nice to have the possibility of configuring Kubernetes task output as a secret.

suggested example:

- task: Kubernetes@1
  inputs:
    connectionType: None
    namespace: $(namespace)
    command: get
    outputFormat: go-template
    outputIsSecret: true
    arguments: >-
      secret
      $(secretName)
      --template="{{.data.password|base64decode}}"
      --ignore-not-found

#azure pipelines logs
...
/agent/_work/_tool/kubectl/1.27.9/x64/kubectl get -n namespace secret secret-name --template={{.data.password|base64decode}} --ignore-not-found -o go-template
##[debug]Called Toolrunner exec() method asynchronously. Returning the promise.
***
##[debug]Exit code 0 received from tool '/agent/_work/_tool/kubectl/1.27.9/x64/kubectl'
##[debug]STDIO streams have closed for tool '/agent/_work/_tool/kubectl/1.27.9/x64/kubectl'
##[debug]Toolrunner exec() method returned successfully for the kubectl command.
commandOutput***
##[debug]set KubectlOutput=***
##[debug]Processed: ##vso[task.setvariable variable=KubectlOutput;isOutput=false;issecret=true;]***
##[debug]outputFormat=go-template
##[debug]task result: Succeeded
##[debug]Processed: ##vso[task.complete result=Succeeded;]
##[debug]connectionType=None
...