powerplatform_enterprise_policy

[mawasile]

This pull request introduces significant updates to the Terraform configuration for managing Power Platform enterprise policies, including encryption and network injection policies. It also adds a new enterprise policy resource to the provider.

Terraform Configuration Updates:

• Added new Terraform configuration for managing Power Platform enterprise policies, including setting up required providers and defining various variables and resources in main.tf files for encryption and network injection policies. [1] [2]
• Introduced a new resource.tf file to manage Power Platform environments and link enterprise policies.
• Added a new variable subscription_id in variables.tf for specifying the Azure subscription ID.

Provider Code Updates:

• Added the enterprise_policy service to the provider's resource list and imports. [1] [2]
• Updated provider tests to include the new enterprise_policy resource. [1] [2]

Enterprise Policy Service Implementation:

• Implemented the enterprise_policy service with methods to link and unlink enterprise policies.
• Defined DTOs and models for the enterprise_policy service. [1] [2]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.05348% with 112 lines in your changes missing coverage. Please review.

Project coverage is 73.48%. Comparing base (754f7a0) to head (fdb7276). Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...es/enterprise_policy/resource_enterprise_policy.go	69.62%	40 Missing and 8 partials :warning:
internal/services/environment/models.go	40.57%	40 Missing and 1 partial :warning:
...ervices/enterprise_policy/api_enterprise_policy.go	79.66%	8 Missing and 4 partials :warning:
internal/services/environment/api_environment.go	50.00%	8 Missing and 2 partials :warning:
internal/customerrors/url_format_error.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #519 +/- ## ========================================== - Coverage 73.84% 73.48% -0.36% ========================================== Files 102 105 +3 Lines 14454 14949 +495 ========================================== + Hits 10673 10986 +313 - Misses 3121 3291 +170 - Partials 660 672 +12 ```

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