Stabilize package versions (#2348)

Author: mmitche

eng/Versions.props

@@ -23,6 +23,11 @@
     <IsServicingBuild Condition=" '$(PreReleaseVersionLabel)' == 'servicing' ">true</IsServicingBuild>
     <!-- This is used for error checking to ensure generated code and baselines are up to date when we increment the patch. -->
     <PreviousExtensionsReleaseVersion Condition=" '$(PatchVersion)' != '0' ">$(MajorVersion).$(MinorVersion).$([MSBuild]::Subtract($(PatchVersion), 1))</PreviousExtensionsReleaseVersion>
+    <!--
+        When StabilizePackageVersion is set to 'true', this branch will produce stable outputs for 'Shipping' packages
+    -->
+    <StabilizePackageVersion Condition="'$(StabilizePackageVersion)' == ''">true</StabilizePackageVersion>
+    <DotNetFinalVersionKind Condition="'$(StabilizePackageVersion)' == 'true'">release</DotNetFinalVersionKind>
   </PropertyGroup>
   <PropertyGroup Label="Arcade settings">
     <!-- Disable Arcade's Xliff tools -->