Use Microsoft-provided template package validation when available #374
Description
Describe the suggested improvement
The documentation for Authoring Tools mentions a package Microsoft.TemplateEngine.Authoring.Tasks that currently can only be used for localization of strings in a template, but in the future should include a Validate task for validating template packages.
See Authoring tools: templates & template packages validation.
We already build the templates and run approval tests on the template output, but once these tools are available it may provide ways to validate that the ide.host.json and dotnetcli.host.json files that are currently hard to test.
Additional Context
No response