Add support to list clusterclass based clusters on TKGs

[prkalle]

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

What this PR does / why we need it

This PR adds supports to list clusterclass based clusters created on TKGS. It would check if the clusterclass feature is enabled on TKGS, if so, would list all the clusters(same as TKGm) which includes both TKC and classy clusters. If the clusterclass feature is not enabled it would list all the TKC clusters.

Which issue(s) this PR fixes

Fixes #2887

Describe testing done for PR

Created both the TKC and ClusterClass based clusters and listed both the clusters successfully

❯ k get tkc -n testns
NAME          CONTROL PLANE   WORKER   TKR NAME                              AGE    READY   TKR COMPATIBLE   UPDATES AVAILABLE
prem-tkc-01   1               1        v1.22.8---vmware.1-tkg.2-zshippable   121m   True    True             [v1.23.5+vmware.1]

❯ ~/go/bin/tanzu cluster list
  NAME         NAMESPACE  STATUS   CONTROLPLANE  WORKERS  KUBERNETES        ROLES   PLAN  TKR
  prem-cc01    testns     running  1/1           1/1      v1.22.8+vmware.1  <none>        v1.22.8---vmware.1-tkg.2-zshippable
  prem-tkc-01  testns     running  1/1           1/1      v1.22.8+vmware.1  <none>        v1.22.8---vmware.1-tkg.2-zshippable

Release note

Add support to list clusterclass based clusters on TKGs

PR Checklist

• Squash the commits into one or a small number of logical commits
  
• Use good commit messages
• Ensure PR contains terms all contributors can understand and links all contributors can access

Additional information

Special notes for your reviewer

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/2886/20220708232418/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

Merging #2886 (6b1137a) into main (e1d1386) will increase coverage by 0.00%.
The diff coverage is 92.85%.

@@           Coverage Diff            @@
##             main    #2886    +/-   ##
========================================
  Coverage   43.80%   43.81%            
========================================
  Files         414      414            
  Lines       41208    41308   +100     
========================================
+ Hits        18053    18098    +45     
- Misses      21466    21514    +48     
- Partials     1689     1696     +7     

Impacted Files	Coverage Δ
pkg/v1/tkg/client/get_cluster.go	54.16% <0.00%> (ø)
pkg/v1/tkg/tkgctl/get_cluster.go	86.66% <100.00%> (+7.71%)	⬆️
addons/pkg/util/gvr_helper.go	59.57% <0.00%> (-8.52%)	⬇️
pkg/v2/tkr/util/topology/cluster.go	63.63% <0.00%> (-7.80%)	⬇️
pkg/v1/tkg/tkgpackageclient/package_update.go	83.57% <0.00%> (-1.43%)	⬇️
addons/controllers/clusterbootstrap_controller.go	63.28% <0.00%> (-1.40%)	⬇️
pkg/v1/tkg/tkgctl/create_cluster.go	60.82% <0.00%> (-0.96%)	⬇️
pkg/v1/tkg/tkgctl/client.go	52.20% <0.00%> (-0.67%)	⬇️
addons/webhooks/clusterbootstrap_webhook.go	24.32% <0.00%> (-0.30%)	⬇️
pkg/v1/tkg/client/upgrade_cluster.go	40.07% <0.00%> (ø)
... and 4 more

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[imikushin]

LGTM. Thanks @prkalle!