Add EnablePrivateLinkFastPath to the Express Route Connection resource

[fjaeckel]

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Description

Add a new optional EnablePrivateLinkFastPath option to the Express Route Connection resource. This enables users to enable the feature via Terraform on their Express Route connection.

I chose enable_private_link_fast_path to align with the Azure documentation, this can be changed of course.

The prior PR #20619 has mentioned to add this option, but it has not added the option. Instead it has added ExpressRouteGatewayBypass.

The option exists for a long time already and is officially documented in the API specs: https://learn.microsoft.com/en-us/azure/templates/microsoft.network/2022-07-01/expressroutegateways?pivots=deployment-language-terraform

I have used the documentation from https://learn.microsoft.com/en-us/azure/templates/microsoft.network/expressroutegateways?pivots=deployment-language-terraform#expressrouteconnectionproperties-2 to supply the necessary documentation.

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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_express_route_connection - support for the enable_private_link_fast_path property

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)

[stephybun]

Thanks for this @fjaeckel. I left some comments and questions in-line. If you can take a look through those then we'll be happy to give this another review.

[fjaeckel]

Tests failed prior, because I accidentally changed the name of the Azure side Parameter, even though it was correct the first time. Fixed in 6ce4de4

[stephybun]

Thanks @fjaeckel LGTM 👍

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