Prep only: WN .NET10 Prev 3: webapiaot template adds OpenAPI (#35190)

Prep only move draft to include so it can be compared in final PR

Author: wadepickett

aspnetcore/release-notes/aspnetcore-10/includes/webapiaotTemplateAddedOpenAPI.md

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+### Add Microsoft.AspNetCore.OpenApi to the webapiaot template
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+Support for OpenAPI document generation with the Microsoft.AspNetCore.OpenApi packagte is now included by default in the webapiaot project template. This support can be disabled if desired by using the `--no-openapi` flag when creating a new project.
+
+This was a community contribution by @sander1095. Thanks for this contribution!