Add Azure subscription and tenant info to interactive mode configuration summary

[Copilot]

When using interactive mode (Invoke-AzBootstrap without parameters), the configuration summary now displays the target Azure subscription and tenant information to help users confirm they're deploying to the correct environment.

Changes Made

Added two new lines to the configuration summary display:

• Azure Subscription: Shows subscription name and ID in format {SubscriptionName} ({SubscriptionId})
• Azure Tenant ID: Shows the tenant ID

Example Output

--- Configuration Summary ---
Template Repository URL      : kewalaka/terraform-azure-starter-template
Target Repository            : myorg/my-project
Azure Subscription           : My Dev Subscription (12345678-1234-1234-1234-123456789012)
Azure Tenant ID              : 87654321-4321-4321-4321-210987654321
Azure Location               : eastus
Resource Group Name          : rg-my-project-dev
Plan Managed Identity Name   : mi-my-project-dev-plan
Apply Managed Identity Name  : mi-my-project-dev-apply
Terraform State Storage Name : stmyprojectdev123
----------------------------

Implementation Details

• Uses existing $azContext object from Get-AzCliContext - no additional API calls required
• Minimal change: only 2 new display lines added to the configuration summary
• No breaking changes to existing functionality
• All existing tests continue to pass

This enhancement improves the user experience by providing clear visibility into which Azure environment will be used for the bootstrap operation.

Fixes #59.

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