Reduce resource providers required for bootstrap

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### Description

**Is your feature request related to a problem?**

The target bootstrap subscription will have all providers installed by the azurerm provider if it is the very first Terraform run. This can cause a delay if there is a regional outage in Azure.

**Describe the solution you'd like**

Explicitly define the the required providers for the bootstrap subscription and only install those. Turn off the default behviour of the provider.

**Additional context**

No files or tests are named. Start by locating the bootstrap subscription configuration and the azurerm provider setup, then determine which providers are required for bootstrap. Done means only those providers are installed and the provider's default behavior is disabled.

Written by the indexing model from the issue text.