Shorten package version properties (dotnet#27784)

* Shorten package version properties
- `$(...PackageVersion)` -> `$(...Version)`
- inspired by a similar dotnet/efcore change
- aligns names with Arcade SDK, meaning our values apply consistently

* Remove unused PublishSymbols.proj and related property
- restore Arcade's control of `$(MicrosoftSymbolUploaderBuildTaskVersion>)`
- would otherwise result in a version downgrade

* Update `$(MicrosoftNetCompilersToolsetVersion)` to match Arcade's value
- avoid using an older toolset
- now successfully overriding Arcade value

* Avoid an odd `CS8603` error
- delete the unused `GetOptionalProperty(...)` method

* Correct an unintentional change reading package metadata
- `%(ReferencePathWithRefAssemblies.NuGetPackageVersion)` is the correct name

Author: dougbu

Diff for: Directory.Build.targets

@@ -37,8 +37,8 @@
     <PackageBrandingVersion>$(VersionPrefix)</PackageBrandingVersion>
     <PackageBrandingVersion Condition=" '$(VersionSuffix)' != '' ">$(PackageBrandingVersion) $(BrandingVersionSuffix.Trim())</PackageBrandingVersion>
 
-    <SiteExtensionPackageVersion>$(VersionPrefix)</SiteExtensionPackageVersion>
-    <SiteExtensionPackageVersion Condition=" '$(VersionSuffix)' != '' ">$(VersionPrefix)-$(VersionSuffix.Replace('.','-'))</SiteExtensionPackageVersion>
+    <SiteExtensionVersion>$(VersionPrefix)</SiteExtensionVersion>
+    <SiteExtensionVersion Condition=" '$(VersionSuffix)' != '' ">$(VersionPrefix)-$(VersionSuffix.Replace('.','-'))</SiteExtensionVersion>
 
     <PackageVersion Condition=" '$(PackageVersion)' == '' ">$(Version)</PackageVersion>
 
@@ -49,7 +49,7 @@
     <TargetingPackVersion>$(SharedFxVersion)</TargetingPackVersion>
     <TargetingPackVersion Condition=" ! $(IsTargetingPackBuilding) ">$(TargetingPackVersionPrefix)</TargetingPackVersion>
 
-    <PackageVersion Condition=" '$(NoSemVer20)' == 'true' ">$(SiteExtensionPackageVersion)</PackageVersion>
+    <PackageVersion Condition=" '$(NoSemVer20)' == 'true' ">$(SiteExtensionVersion)</PackageVersion>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -155,7 +155,7 @@
       <!-- Only update the default runtime version for preview builds. -->
       <DefaultRuntimeFrameworkVersion Condition="'%(TargetFramework)' == '$(KnownAppHostPackOrFrameworkReferenceTfm)' and '$(IsServicingBuild)' != 'true'">$(MicrosoftNETCoreAppRuntimeVersion)</DefaultRuntimeFrameworkVersion>
       <!-- Only update the targeting pack version for preview builds. -->
-      <TargetingPackVersion Condition="'%(TargetFramework)' == '$(KnownAppHostPackOrFrameworkReferenceTfm)' and '$(IsServicingBuild)' != 'true'">$(MicrosoftNETCoreAppRefPackageVersion)</TargetingPackVersion>
+      <TargetingPackVersion Condition="'%(TargetFramework)' == '$(KnownAppHostPackOrFrameworkReferenceTfm)' and '$(IsServicingBuild)' != 'true'">$(MicrosoftNETCoreAppRefVersion)</TargetingPackVersion>
     </KnownFrameworkReference>
 
     <KnownFrameworkReference Condition="'$(UseAspNetCoreSharedRuntime)' != 'true'" Remove="Microsoft.AspNetCore.App" />
@@ -169,7 +169,7 @@
 
     <!-- Track compiler separately from Arcade.-->
     <PackageReference Include="Microsoft.Net.Compilers.Toolset"
-        Version="$(MicrosoftNetCompilersToolsetPackageVersion)"
+        Version="$(MicrosoftNetCompilersToolsetVersion)"
         PrivateAssets="all"
         IsImplicitlyDefined="true" />
   </ItemGroup>

Diff for: docs/ReferenceResolution.md

@@ -54,7 +54,7 @@ Steps for adding a new package dependency to an existing project. Let's say I'm
 1. Add the package to the .csproj file using `<Reference Include="System.Banana" />`
 2. Add an entry to [eng/Dependencies.props](/eng/Dependencies.props) e.g. `<LatestPackageReference Include="System.Banana" />`
 3. If this package comes from another dotnet team and should be updated automatically by our bot&hellip;
-    1. Add an entry to [eng/Versions.props](/eng/Versions.props) like this `<SystemBananaPackageVersion>0.0.1-beta-1</SystemBananaPackageVersion>`.
+    1. Add an entry to [eng/Versions.props](/eng/Versions.props) like this `<SystemBananaVersion>0.0.1-beta-1</SystemBananaVersion>`.
     2. Add an entry to [eng/Version.Details.xml](/eng/Version.Details.xml) like this:
 
         ```xml

Diff for: eng/Dependencies.props

@@ -196,7 +196,7 @@ and are generated based on the last package release.
 
     <!-- Get versions. -->
     <LatestPackageReference Update="@(LatestPackageReference)">
-      <Version>$(%(VersionName)PackageVersion)</Version>
+      <Version>$(%(VersionName)Version)</Version>
     </LatestPackageReference>
 
     <!--