fix(argo-workflows): add app: label to components to match upstream

[tico24]

Closes #2774

Here's the resulting labels on the controller pod when running a default install on this pr:

  template:
    metadata:
      labels:
        helm.sh/chart: argo-workflows-0.41.10
        app.kubernetes.io/name: argo-workflows-workflow-controller
        app.kubernetes.io/instance: release-name
        app.kubernetes.io/component: workflow-controller
        app: workflow-controller
        app.kubernetes.io/managed-by: Helm
        app.kubernetes.io/part-of: argo-workflows
        app.kubernetes.io/version: "v3.5.8"
    spec:

Nothing has been removed so I don't believe this is a breaking change.

Checklist:

• I have bumped the chart version according to versioning
• I have updated the documentation according to documentation
• I have updated the chart changelog with all the changes that come with this pull request according to changelog.
• Any new values are backwards compatible and/or have sensible default.
• I have signed off all my commits as required by DCO.
• My build is green (troubleshooting builds).

[yu-croco]

Great catch! 🚀