[backport release-0.25 branch]Add support for "tanzu cluster get" to show tree view of cluster for …

[prkalle]

…TKGS

• It would be best effort to show the treeview of the cluster object for TKGS provider
  because the older TKGS versions supports different CAPI version causing the clusterctl
  describe library unable to query/list the clsuter objects. So if clusterctl library
  successfully query the objects the treeview would be shown.
  Signed-off-by: Prem Kumar Kalle pkalle@vmware.com

Signed-off-by: Prem Kumar Kalle pkalle@vmware.com

What this PR does / why we need it

This PR adds support for "tanzu cluster get" command to show details (tree view) for TKGS

Which issue(s) this PR fixes

Fixes #1063

Describe testing done for PR

Tested with version of TKGS that has CAPI version v1alpha3 , it didn't show the cluster resources details(tree view). If user wants to know why it is not being shown, using log verbose level 1 or higher would show the warning message

❯ tanzu cluster get guestcluster1 -n gctest
  NAME           NAMESPACE  STATUS   CONTROLPLANE  WORKERS  KUBERNETES                       ROLES   TKR
  guestcluster1  gctest     running  1/1           2/2      v1.20.12+vmware.1-tkg.1.10b2767  <none>  v1.20.12---vmware.1-tkg.1.10b2767
❯ tanzu cluster get guestcluster1 -n gctest -v 1
  NAME           NAMESPACE  STATUS   CONTROLPLANE  WORKERS  KUBERNETES                       ROLES   TKR
  guestcluster1  gctest     running  1/1           2/2      v1.20.12+vmware.1-tkg.1.10b2767  <none>  v1.20.12---vmware.1-tkg.1.10b2767


  Warning! Unable to get cluster ObjectTree/cluster objects, so detailed(tree) view of cluster resources is not available!!

Tested with with version of TKGS that has CAPI version v1beta1 and it successfully shown the cluster resources details(tree view)

❯ tanzu cluster list
  NAME          NAMESPACE  STATUS    CONTROLPLANE  WORKERS  KUBERNETES        ROLES   PLAN  TKR
  test01        ns01       deleting  1/1                    v1.23.8+vmware.2  <none>        v1.23.8---vmware.2-tkg.1-zshippable
  test02        ns01       running   1/1           1/1      v1.23.8+vmware.2  <none>        v1.23.8---vmware.2-tkg.2-zshippable
  tkc-e2e-2wj4  ns01       running   1/1           1/1      v1.23.8+vmware.2  <none>        v1.23.8---vmware.2-tkg.2-zshippable
  tkc-e2e-keaf  ns01       running   1/1           1/1      v1.23.8+vmware.2  <none>        v1.23.8---vmware.2-tkg.1-zshippable
❯ tanzu cluster get test02 -n ns01
  NAME    NAMESPACE  STATUS   CONTROLPLANE  WORKERS  KUBERNETES        ROLES   TKR
  test02  ns01       running  1/1           1/1      v1.23.8+vmware.2  <none>  v1.23.8---vmware.2-tkg.2-zshippable


Details:

NAME                                                    READY  SEVERITY  REASON  SINCE  MESSAGE
/test02                                                 True                     4h42m
├─ClusterInfrastructure - VSphereCluster/test02-xvgl8   True                     4h45m
├─ControlPlane - KubeadmControlPlane/test02-dn8n2       True                     4h42m
│ └─Machine/test02-dn8n2-xvnck                          True                     4h42m
└─Workers
  └─MachineDeployment/test02-node-pool-1-2xmrf          True                     4h39m
    └─Machine/test02-node-pool-1-2xmrf-5bfc945cb-rrkqr  True                     4h40m

Release note

Adds support for "tanzu cluster get" command to show details (tree view) for TKGS

Additional information

Special notes for your reviewer

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/3087/20220805150052/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[codecov]

Codecov Report

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❗ Current head 47ee172 differs from pull request most recent head 6358333. Consider uploading reports for the commit 6358333 to get more accurate results

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[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/3087/20220808162418/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/3087/20220808162438/clustergen.diff.txt
Author/reviewers:
Please review to verify that the effects on the generated cluster configurations are exactly what the PR intended, and give a thumbs-up if so.