🌱 Make Flavor gen templates vcsim friendly

[fabriziopandini]

What this PR does / why we need it:
Add CONTROL_PLANE_ENDPOINT_PORT env var / cluster class var as required by vcsim

[chrischdi]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: dd64deafd9515dca81668963e4f69cfd2e910277

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chrischdi

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.93%. Comparing base (9a3e4ea) to head (0dba5fe).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2771      +/-   ##
==========================================
- Coverage   63.97%   63.93%   -0.04%     
==========================================
  Files         160      160              
  Lines        9345     9345              
==========================================
- Hits         5978     5975       -3     
- Misses       2908     2910       +2     
- Partials      459      460       +1     

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[k8s-ci-robot]

@fabriziopandini: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-provider-vsphere-apidiff-main	0dba5fe	link	false	/test pull-cluster-api-provider-vsphere-apidiff-main

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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