azurerm_application_gateway - add support for more status_code on custom_error_configuration

[Infiniteez]

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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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  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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Testing

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Change Log

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

• azurerm_application_gateway - custom_error_configuration now supports more status_codes [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 #23280

Note

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

[katbyte]

Thanks @Infiniteez - LGTM 🛋️

[katbyte]

@Infiniteez - could we fix up CI?

[Infiniteez]

@katbyte done!

[katbyte]

LGTM 🪐