Add harvester_api_server output to harvester-integration module

[HiranAdikari]

Summary

• Adds harvester_api_server output to modules/management/harvester-integration
• Value is extracted from local._matched_cluster.cluster.server — already computed internally, no new parsing
• Marked sensitive = true (derives from harvester_kubeconfig)
• Returns null when create_cloud_credential = false (brownfield)

Why

Consumers that provision RKE2 clusters via harvester-cloud-credential need the direct Harvester API URL (https://<vip>:6443). Without this output they must hardcode the VIP, which is environment-specific and error-prone.

Consumer pattern

# 02-management/outputs.tf
output "harvester_api_server" {
  value     = module.harvester_integration.harvester_api_server
  sensitive = true
}

# 08-workloads — via remote state
module "my_cluster_cred" {
  source               = "...harvester-cloud-credential..."
  harvester_api_server = data.terraform_remote_state.management.outputs.harvester_api_server
  ...
}

Test plan

• Apply 02-management with create_cloud_credential = true — verify output matches the VIP in the kubeconfig
• Apply with create_cloud_credential = false — verify output is null

Closes #57

🤖 Generated with Claude Code

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Review profile: CHILL

Plan: Pro

Run ID: 74bf1f17-8c6c-4206-afbb-f112cc760ae6

📥 Commits

Reviewing files that changed from the base of the PR and between c64fe87 and 8b19de7.

📒 Files selected for processing (2)

• modules/management/harvester-integration/main.tf
• modules/management/harvester-integration/outputs.tf

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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