v10: Cleanup project files (#13111)

* Backport project cleanup from #12907

* Remove empty Directory.Build.props

* Fix GenerateAppsettingsSchema target

* Re-add empty Directory.Build.props to prevent inheritance

* Add NRT to-do comment

* Explicitly generate HTTPS development certificate for E2E test

tests/Umbraco.Tests.AcceptanceTest/misc/Directory.Build.props

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project>
+    <!--
+        Keep this empty Directory.Build.props file to prevent inheriting from parent directories,
+        because the Windows E2E test that outputs a new Umbraco project into this directory otherwise won't build.
+    -->
+</Project>

tests/Umbraco.Tests.AcceptanceTest/misc/nuget.config

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <packageSources>
+    <clear />
     <add key="local" value="./nupkg" />
     <add key="nuget" value="https://api.nuget.org/v3/index.json" />
   </packageSources>

tests/Umbraco.Tests.AcceptanceTest/misc/umbraco-linux.docker

@@ -11,9 +11,10 @@ COPY nupkg .
 
 WORKDIR /build
 RUN dotnet new --install /nupkg/Umbraco.Templates.*.nupkg
-RUN dotnet new umbraco --name Playwright -o . --no-restore
+RUN dotnet new umbraco --name Playwright --no-restore --output .
 RUN dotnet restore --configfile /nuget.config
-RUN dotnet publish --no-restore --configuration Release -o /dist 
+RUN dotnet build --configuration Release --no-restore
+RUN dotnet publish --configuration Release --no-build --output /dist
 
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 ## Run