bugfix: provider validation for subscription_id

[manicminer]

Using the following test configuration:

terraform {
  required_providers {
    azurerm = {
      source  = "hashicorp/azurerm"
      version = "4.0.0"
    }
  }
}

provider "azurerm" {
  features {}
}

data "azurerm_client_config" "test" {}

resource "azurerm_resource_group" "test" {
  name     = "aaatest-foo"
  location = "westeurope"
}

terraform validate with no subscription ID

terraform validate with invalid subscription ID

terraform validate with valid subscription ID

terraform plan with no subscription ID

terraform plan with invalid subscription ID

terraform plan with valid subscription ID

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• provider: fix a validation bug that prevents terraform validate from working when subscription_id is not specified

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

fixes: #27154 #27175

[mbfrahry]

LGTM

[katbyte]

LGTM 🧪

[github-actions]

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