Test: Add features {} to the provider block

[magodo]

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Description

A follow up of #28052, where there are acctests have the provider "azurerm" {} block, but empty.

This PR uses the same way as #28052, finding out test configs that have no features defined, via

$ grep -rL "features" | sort
TestAccRoleManagementPolicyDataSource_managementGroup/0/terraform_plugin_test.tf
TestAccRoleManagementPolicyDataSource_resource/0/terraform_plugin_test.tf
TestAccRoleManagementPolicyDataSource_resourceGroup/0/terraform_plugin_test.tf
TestAccRoleManagementPolicyDataSource_subscription/0/terraform_plugin_test.tf
TestAccRoleManagementPolicy_managementGroup/0/terraform_plugin_test.tf
TestAccRoleManagementPolicy_resource/0/terraform_plugin_test.tf
TestAccRoleManagementPolicy_resource/2/terraform_plugin_test.tf
TestAccRoleManagementPolicy_resourceGroup/0/terraform_plugin_test.tf
TestAccRoleManagementPolicy_resourceGroup/2/terraform_plugin_test.tf
TestAccRoleManagementPolicy_resourceGroup_activationRulesUpdate/0/terraform_plugin_test.tf
TestAccRoleManagementPolicy_resourceGroup_activationRulesUpdate/2/terraform_plugin_test.tf
TestAccRoleManagementPolicy_subscription/0/terraform_plugin_test.tf
TestAccRoleManagementPolicy_subscription/2/terraform_plugin_test.tf
TestAccStorageBlob_appendEmpty/0/terraform_plugin_test.tf
TestAccStorageBlob_appendEmptyMetaData/0/terraform_plugin_test.tf
TestAccStorageBlob_archive/0/terraform_plugin_test.tf
TestAccStorageBlob_blockEmpty/0/terraform_plugin_test.tf
TestAccStorageBlob_blockEmptyAzureADAuth/0/terraform_plugin_test.tf
TestAccStorageBlob_disappears/0/terraform_plugin_test.tf

Note

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