azurerm_app_service_environment_v3 - add support for upgrade_preference

[aqche]

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Description

Fixes #24590

This PR adds support for the upgrade_preference argument to the azurerm_app_service_environment_v3 resource.

=== RUN   TestAccAppServiceEnvironmentV3_upgradePreference
=== PAUSE TestAccAppServiceEnvironmentV3_upgradePreference
=== CONT  TestAccAppServiceEnvironmentV3_upgradePreference
--- PASS: TestAccAppServiceEnvironmentV3_upgradePreference (10445.64s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/appservice    10445.690s

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
• I have updated/added Documentation as required written in a helpful and kind way to assist users that may be unfamiliar with the resource / data source.
• I have used a meaningful PR title to help maintainers and other users understand this change and help prevent duplicate work.
  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

Changes to existing Resource / Data Source

• I have added an explanation of what my changes do and why I'd like you to include them (This may be covered by linking to an issue above, but may benefit from additional explanation).
• I have written new tests for my resource or datasource changes & updated any relevant documentation.
• I have successfully run tests with my changes locally. If not, please provide details on testing challenges that prevented you running the tests.
• (For changes that include a state migration only). I have manually tested the migration path between relevant versions of the provider.

Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

Change Log

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

• azurerm_app_service_environment_v3 - support for the upgrade_preference property [azurerm_app_service_environment_v3 - add support for upgrade_preference #32202]

This is a (please select all that apply):

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

Related Issue(s)

Fixes #24590

AI Assistance Disclosure

• AI Assisted - This contribution was made by, or with the assistance of, AI/LLMs

Gemini search assisted me with finding relevant Azure API docs for App Service Environment.

Rollback Plan

Revert the change and remove the property.

Changes to Security Controls

No

Note

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