Include Dispatcher Validator in Maven Build

As there are quite some limitations with regards to the HTTPD and Dispatcher configuration it makes sense to run the validation (https://experienceleague.adobe.com/docs/experience-manager-cloud-service/implementing/content-delivery/disp-overview.html?lang=en#testing-apache-and-dispatcher-configuration-locally) as part of the Maven build for the dispatcher Maven module as well.

Start by locating the dispatcher Maven module and its current build configuration, then read the linked Adobe documentation for local HTTPD and Dispatcher validation. Done means the Dispatcher validator runs as part of that module's Maven build.

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