feat: Propagate creator labels of a CronWorkflow to the Workflow to be scheduled

[umi0410]

Fixes #7286

Motivation

Currently, the creator labels of a CronWorkflow that has creator labels are not propagated to the Workflow to be scheduled.

Modifications

I made some labels related to the creator of a CronWorkflow to be propagated to the Workflow to be created.
The list of labels is as follows.

• workflows.argoproj.io/creator
• workflows.argoproj.io/creator-email
• workflows.argoproj.io/creator-preferred-username

Verification

1. Create a simple CronWorkflow like the following in the web console of an SSO-enabled environment:

   metadata:
     name: cron-workflow-test
   spec:
     workflowSpec:
       templates:
         - name: whalesay
           inputs: {}
           outputs: {}
           metadata: {}
           container:
             name: ''
             image: alpine:3.6
             command:
               - sh
               - '-c'
             args:
               - date; sleep 3
             resources: {}
       entrypoint: whalesay
       arguments: {}
     schedule: '* * * * *'
     concurrencyPolicy: Replace
     startingDeadlineSeconds: 0

2. You can see the created CronWorkflow has some labels related to the creator's account:

   $ kubectl get cronwf cron-workflow-test -o yaml | yq '.metadata.labels'
     workflows.argoproj.io/creator: xxxxxxxxx-yyy-zzzz-aaaa-bbbbbbbbbb
     workflows.argoproj.io/creator-email: foo.at.example.com
     workflows.argoproj.io/creator-preferred-username: foo

3. You can also see the Workflow created has the same creator-related labels. This is the new feature of this PR.

   $ kubectl get wf cron-workflow-test-1689872520 -o yaml | yq '.metadata.labels'
     workflows.argoproj.io/completed: "true"
     workflows.argoproj.io/creator: xxxxxxxxx-yyy-zzzz-aaaa-bbbbbbbbbb
     workflows.argoproj.io/creator-email: foo.at.example.com
     workflows.argoproj.io/creator-preferred-username: foo
     workflows.argoproj.io/cron-workflow: cron-workflow-test
     workflows.argoproj.io/phase: Succeeded

4. Additionally, when loglevel of workflow-controller is set to debug, you can see the log of propagating sso labels at workflow-controller.
   The following is an example of logs about my account.

   time="2023-07-20T16:44:00.003Z" level=debug msg="propagated the label of the cron workflow to the workflow to be scheduled." key=workflows.argoproj.io/creator value=xxxxxxxxx-yyy-zzzz-aaaa-bbbbbbbbbb
   time="2023-07-20T16:44:00.003Z" level=debug msg="propagated the label of the cron workflow to the workflow to be scheduled." key=workflows.argoproj.io/creator-email value=foo.at.example.com
   time="2023-07-20T16:44:00.003Z" level=debug msg="propagated the label of the cron workflow to the workflow to be scheduled." key=workflows.argoproj.io/creator-preferred-username value=foo
   

[terrytangyuan]

This is great. Thanks!