feat(cloud): add delete endpoint for PrivateLink

[joshrotenberg]

Summary

Add support for deleting PrivateLink configuration.

Current state

We have:

• cloud connectivity privatelink get
• cloud connectivity privatelink create
• cloud connectivity privatelink add-principal
• cloud connectivity privatelink remove-principal
• cloud connectivity privatelink get-script

Missing

• DELETE /subscriptions/{subscriptionId}/private-link - Delete PrivateLink

CLI Command

• cloud connectivity privatelink delete <subscription_id>

Notes

• Destructive operation - should require confirmation
• May need --force flag to skip confirmation