Change port value to string in kube-vip jsonPatch

[ydp]

What this PR does / why we need it

The port in kube-vip manifest env needs to be string if it is set, otherwise parsing manifest fails.

Which issue(s) this PR fixes

Fixes #3803

Describe testing done for PR

Manually created cluster with customized CLUSTER_API_SERVER_PORT.

Release note

Support CLUSTER_API_SERVER_PORT in classy cluster on vSphere

Additional information

Special notes for your reviewer

[github-actions]

Cluster Generation A/B Results:
https://storage.googleapis.com/tkg-clustergen/3804/20221101103730/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 #3804 (2b144aa) into main (986bff7) will decrease coverage by 0.90%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3804      +/-   ##
==========================================
- Coverage   46.60%   45.69%   -0.91%     
==========================================
  Files         400      425      +25     
  Lines       39726    41282    +1556     
==========================================
+ Hits        18514    18864     +350     
- Misses      19514    20702    +1188     
- Partials     1698     1716      +18     

Impacted Files	Coverage Δ
...oller-manager/controllers/v3_cascade_controller.go	56.19% <0.00%> (-5.72%)	⬇️
...ons/controllers/packageinstallstatus_controller.go	77.99% <0.00%> (-1.16%)	⬇️
cmd/cli/plugin/cluster/upgrade.go	58.50% <0.00%> (ø)
cmd/cli/plugin/cluster/delete_node_pool.go	16.66% <0.00%> (ø)
cmd/cli/plugin/cluster/credentials_update.go	9.23% <0.00%> (ø)
cmd/cli/plugin/cluster/get.go	6.27% <0.00%> (ø)
...i/plugin/cluster/delete_machinehealthcheck_node.go	16.66% <0.00%> (ø)
cmd/cli/plugin/cluster/list.go	9.52% <0.00%> (ø)
cmd/cli/plugin/cluster/available_upgrade.go	16.32% <0.00%> (ø)
cmd/cli/plugin/cluster/get_machinehealthcheck.go	11.42% <0.00%> (ø)
... and 18 more

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