Reduce references to Microsoft.AspNetCore.App.Runtime.csproj (#25836)

- dotnet-watch builds against runtime in the SDK
- other projects build after runtime project due to Ref.csproj reference
  - but, when the targeting packs aren't building, there's no reason to use Ref.csproj
- followup on 76fbd1a and 8496266, reducing parallelism in build

Author: dougbu

src/Framework/test/Microsoft.AspNetCore.App.UnitTests.csproj

@@ -51,11 +51,13 @@
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\App.Ref\src\Microsoft.AspNetCore.App.Ref.csproj">
+    <ProjectReference Include="..\App.Ref\src\Microsoft.AspNetCore.App.Ref.csproj"
+        Condition=" $(IsTargetingPackBuilding) ">
       <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
       <SkipGetTargetFrameworkProperties>true</SkipGetTargetFrameworkProperties>
     </ProjectReference>
-    <ProjectReference Include="..\App.Runtime\src\Microsoft.AspNetCore.App.Runtime.csproj">
+    <ProjectReference Include="..\App.Runtime\src\Microsoft.AspNetCore.App.Runtime.csproj"
+        Condition=" !$(IsTargetingPackBuilding) ">
       <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
       <SkipGetTargetFrameworkProperties>true</SkipGetTargetFrameworkProperties>
     </ProjectReference>

src/SiteExtensions/LoggingBranch/LB.csproj

@@ -16,19 +16,21 @@
     <IncludeSymbols>false</IncludeSymbols>
     <NoSemVer20>true</NoSemVer20>
     <IsShippingPackage>false</IsShippingPackage>
-    
+
     <!-- No source files -->
     <NoWarn>$(NoWarn);CS2008</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>
     <HostingStartupRuntimeStoreTargets Include="$(DefaultNetCoreTargetFramework)" Runtime="$(TargetRuntimeIdentifier)" />
 
-    <ProjectReference Include="..\..\Framework\App.Ref\src\Microsoft.AspNetCore.App.Ref.csproj">
+    <ProjectReference Include="..\..\Framework\App.Ref\src\Microsoft.AspNetCore.App.Ref.csproj"
+        Condition=" $(IsTargetingPackBuilding) ">
       <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
       <SkipGetTargetFrameworkProperties>true</SkipGetTargetFrameworkProperties>
     </ProjectReference>
-    <ProjectReference Include="..\..\Framework\App.Runtime\src\Microsoft.AspNetCore.App.Runtime.csproj">
+    <ProjectReference Include="..\..\Framework\App.Runtime\src\Microsoft.AspNetCore.App.Runtime.csproj"
+        Condition=" !$(IsTargetingPackBuilding) ">
       <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
       <SkipGetTargetFrameworkProperties>true</SkipGetTargetFrameworkProperties>
     </ProjectReference>

src/Tools/dotnet-watch/src/dotnet-watch.csproj

@@ -29,12 +29,6 @@
   <ItemGroup>
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
 
-   <ProjectReference
-      Include="$(RepoRoot)src\Framework\App.Runtime\src\Microsoft.AspNetCore.App.Runtime.csproj"
-      PrivateAssets="All"
-      ReferenceOutputAssembly="false"
-      SkipGetTargetFrameworkProperties="true" />
-
     <Reference
       Include="Microsoft.AspNetCore.Watch.BrowserRefresh"
       PrivateAssets="All"