Tanzu context list should star the context that was specified by tanzu context use

[benjaminapetersen]

Describe the feature request

tanzu context list ought have a * or signifier next to the default context in use similar to how kubectl will show the currently used context:

# which one is currently set?
tanzu context list
Target:  kubernetes
  NAME                 ISACTIVE  ENDPOINT  KUBECONFIGPATH                                                                               KUBECONTEXT
  tkg-capz-mgmt-azure  false               /Users/you/.kube/config-files/azure.yaml                                              tkg-capz-mgmt-azure-admin@tkg-capz-mgmt-azure
  tkg-mgmt-vc          true                /Users/you/.kube/config-files/vsphere.yaml  tkg-mgmt-vc-admin@tkg-mgmt-vc

# kubeconfig tells me which one it is using
kubectl config get-contexts
CURRENT   NAME                                                CLUSTER                 AUTHINFO                      NAMESPACE
          tkg-capz-azure-antrea-admin@tkg-capz-azure-antrea   tkg-capz-azure-antrea   tkg-capz-azure-antrea-admin
*         tkg-capz-mgmt-azure-admin@tkg-capz-mgmt-azure       tkg-capz-mgmt-azure     tkg-capz-mgmt-azure-admin
          tkg-mgmt-vc-admin@tkg-mgmt-vc                       tkg-mgmt-vc             tkg-mgmt-vc-admin

Describe alternative(s) you've considered

N/A

Affected product area (please put an X in all that apply)

• ( ) APIs
• ( ) Addons
• (x) CLI
• ( ) Docs
• ( ) IAM
• ( ) Installation
• ( ) Plugin
• ( ) Security
• ( ) Test and Release
• ( ) User Experience
• ( ) Developer Experience

Additional context

N/A