azurerm_service_plan - Adding isolated memory intensive SKUs for azurerm_app_service_environment_v3

[adrianfuro]

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Description

This PR will add "I1mv2", "I2mv2", "I3mv2", "I4mv2", "I5mv2" SKU's as available options for azurerm_service_plan resource. These SKUs are available in Portal and API but not on Terraform since they were added in 2024 as supported SKUs officially.

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

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• I have written new tests for my resource or datasource changes & updated any relevent 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)

➜  terraform-provider-azurerm git:(main) ✗ TF_ACC=1 go test -v ./internal/services/appservice -run=TestAccServicePlanIsolated_appServiceEnvironmentV3memoryIntensive -timeout 60m -ldflags="-X=github.com/hashicorp/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccServicePlanIsolated_appServiceEnvironmentV3memoryIntensive
=== PAUSE TestAccServicePlanIsolated_appServiceEnvironmentV3memoryIntensive
=== CONT  TestAccServicePlanIsolated_appServiceEnvironmentV3memoryIntensive
--- PASS: TestAccServicePlanIsolated_appServiceEnvironmentV3memoryIntensive (3517.66s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/appservice    3519.318s

Change Log

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

• azurerm_service_plan - adding memory intensive SKU's that are only available through API and Azure Portal

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 #26853

Note

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

[adrianfuro]

I've added necessary tests for the enhancement