Remove invalid Terraform moved block for sa_import_external

[Copilot]

What is being addressed

A review comment identified an invalid Terraform moved block in core/terraform/airlock/storage_accounts.tf: it attempted to move azurerm_storage_account.sa_import_external while that source address is still declared in configuration. This can cause terraform plan/apply to fail with moved-block configuration errors.

How is this addressed

• Scoped fix for the referenced review comment

  • Removed only the invalid moved block mapping:
    • from = azurerm_storage_account.sa_import_external
    • to = azurerm_storage_account.sa_airlock_core

• No broader refactor

  • Kept all other storage-account resources and move mappings unchanged to stay strictly within the single-comment scope.

• Resulting top-of-file shape

  moved {
    from = azurerm_storage_account.sa_import_in_progress
    to   = azurerm_storage_account.sa_airlock_workspace_global
  }

• Docs / changelog / versioning

  • No documentation updates required for this targeted Terraform metadata correction.
  • No CHANGELOG.md or template version updates required for this scope.