[WIP] Add test case for provisioning rke2 on vsphere

[Copilot]

Plan: Add vSphere RKE2 Provisioning Test

Based on analysis of the existing test structure in validation/provisioning/rke2/, I have created a comprehensive test case for provisioning RKE2 on vSphere.

Current State

• ✅ Analyzed existing test structure in validation/provisioning/rke2/
• ✅ Reviewed node_driver_test.go as reference
• ✅ Reviewed cloud_provider_test.go which has TestVSphereCloudProvider
• ✅ Identified that a dedicated vSphere provisioning test is needed

Implementation

• ✅ Created vsphere_provisioning_test.go with dedicated RKE2 vSphere provisioning test
• ✅ Included various node configurations (all-in-one, shared, dedicated roles)
• ✅ Added vSphere-specific test scenarios including Windows support
• ✅ Followed existing test patterns from node_driver_test.go
• ✅ Included proper test setup, cluster provisioning, and verification steps
• ✅ Added comprehensive documentation to README.md
• ✅ Fixed loop variable capture issue in cleanup function
• Run final validation checks (security, code review)

Test Cases Added

1. RKE2_vSphere|etcd_cp_worker - Single node with all roles
2. RKE2_vSphere|etcd_cp|worker - Shared etcd/control plane nodes
3. RKE2_vSphere|etcd|cp|worker - Dedicated nodes for each role
4. RKE2_vSphere|etcd|cp|worker|windows - Includes Windows worker nodes
5. RKE2_vSphere|3_etcd|2_cp|3_worker - Multiple nodes per role

Original prompt

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This section details on the original issue you should resolve

<issue_title>[TEST] Add Test case for provisioning rke2 on vsphere</issue_title>
<issue_description></issue_description>

<agent_instructions>use the existing structure for provisioning tests located at validation/provisioning/rke2 as a reference. </agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [TEST] Add Test case for provisioning rke2 on vsphere #465

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