testing: groundwork for Binary Testing

[tombuildsstuff]

This PR adds the necessary groundwork for Binary Testing to work in a feature-toggled manner. There's a few components necessary for this to work:

1. Removing the remaining dependencies on acceptance.AzureProvider (in flight)
2. Upgrading the Plugin SDK to use v1.16.0
3. Turning on the feature toggle

As such whilst this work isn't immediately usable, after rebasing this on top of the changes from 1, including 2 and turning on 3 - both Binary Testing and the current testing framework both work.

Note to reviewers: the features block defined below is intentionally using the default feature-set - since the Exists functions within the test framework don't (and shouldn't) make use of them (but they are available during Terraform runtime)

[jackofallops]

Thanks @tombuildsstuff - LGTM 👍

[ghost]

This has been released in version 2.47.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.47.0"
}
# ... other configuration ...

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 [email protected]. Thanks!