V10: Reintroduce appsettings-schema.json (#12416)

* Reintroduce language files tests (#12367)

* Reintroducing language files tests

* Fix casing

* Update tests/Umbraco.Tests.UnitTests/Umbraco.Core/EmbeddedResources/LanguageXmlTests.cs

Co-authored-by: Mole <nikolajlauridsen@protonmail.ch>

* Change Umbraco.Cms and Umbraco.Templates nuspecs to csproj

* Remove Umbraco.Templates from VerifyNuGet step

* Remove duplicate and unnecessary properties

* Generate json schema on build

* Add targets file

* Gitignore auto generated appsettings schema

* Fix build not copying file

* Use the new path in appsettings

* Update copy message

* Build json schema as release

* Update json schema options

Otherwise just running the project will put the file in the wrong place

* Generate schema if it doesn't exist in Web.Ui

* Update json schema options

Otherwise just running the project will put the file in the wrong place

Co-authored-by: Elitsa Marinovska <21998037+elit0451@users.noreply.github.com>
Co-authored-by: Ronald Barendse <ronald@barend.se>

templates/UmbracoProject/appsettings.Development.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "./umbraco/config/appsettings-schema.json",
+  "$schema": "./appsettings-schema.json",
   "Serilog": {
     "MinimumLevel": {
       "Default": "Information"