fix(sdk): include auto-discovered templates in VSIX

Add Content items for auto-discovered project and item templates so they
are included in the VSIX package. The removal of template zipping also
removed the mechanism that added templates to the VSIX, which broke
auto-discovery scenarios.

Author: CalvinAllen

src/CodingWithCalvin.VsixSdk/Sdk/Sdk.Vsix.Templates.targets

@@ -37,6 +37,28 @@
         <_TemplateFolderName>%(_DiscoveredItemTemplateFiles.Filename)</_TemplateFolderName>
       </VsixItemTemplate>
     </ItemGroup>
+
+    <!--
+      Include all files from discovered template folders in the VSIX.
+      Templates are added as folders (not zipped) for VSSDK compatibility.
+    -->
+    <ItemGroup Condition="'@(_DiscoveredProjectTemplateFiles)' != ''">
+      <_ProjectTemplateFiles Include="$(MSBuildProjectDirectory)\$(VsixProjectTemplatesFolder)\**\*" />
+      <Content Include="@(_ProjectTemplateFiles)">
+        <IncludeInVSIX>true</IncludeInVSIX>
+        <VSIXSubPath>$(VsixProjectTemplatesFolder)\%(RecursiveDir)</VSIXSubPath>
+        <CopyToOutputDirectory>Never</CopyToOutputDirectory>
+      </Content>
+    </ItemGroup>
+
+    <ItemGroup Condition="'@(_DiscoveredItemTemplateFiles)' != ''">
+      <_ItemTemplateFiles Include="$(MSBuildProjectDirectory)\$(VsixItemTemplatesFolder)\**\*" />
+      <Content Include="@(_ItemTemplateFiles)">
+        <IncludeInVSIX>true</IncludeInVSIX>
+        <VSIXSubPath>$(VsixItemTemplatesFolder)\%(RecursiveDir)</VSIXSubPath>
+        <CopyToOutputDirectory>Never</CopyToOutputDirectory>
+      </Content>
+    </ItemGroup>
   </Target>
 
   <!--