azurerm_application_gateway - fix check for the rewrite_rule block when using the Basic SKU.

[teowa]

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Description

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.
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• 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.
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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)

TF_ACC=1 go test -v ./internal/services/network -parallel 5 -run TestAccApplicationGateway_basicSku -timeout 2h -ldflags="-X=github.com/hashicorp/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccApplicationGateway_basicSku
=== PAUSE TestAccApplicationGateway_basicSku
=== CONT  TestAccApplicationGateway_basicSku
--- PASS: TestAccApplicationGateway_basicSku (561.27s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/network       561.291s

Change Log

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

• azurerm_resource - support for the thing1 property [GH-00000]

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 #27965

Note

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

[stephybun]

Thanks @teowa LGTM 👍