Merged PR 37130: Mark Microsoft.AspNetCore.Testing package as stable

Mark Microsoft.AspNetCore.Testing package as stable

Author: joperezr

eng/Versions.props

@@ -11,8 +11,11 @@
     <AssemblyVersion>$(MajorVersion).$(MinorVersion).0.0</AssemblyVersion>
     <!--
         When DotNetFinalVersionKind is set to 'release', this branch will produce stable outputs for 'Shipping' packages
+
+        In 8.0, we shipped this package as stable even when it was in the dev stage, so we
+        keep it as stable for compatiblity.
     -->
-    <DotNetFinalVersionKind Condition="'$(DotNetFinalVersionKind)' == '' And '$(Stage)' != 'dev'">release</DotNetFinalVersionKind>
+    <DotNetFinalVersionKind Condition="'$(DotNetFinalVersionKind)' == '' And ('$(Stage)' != 'dev' Or '$(MSBuildProjectName)' == 'Microsoft.AspNetCore.Testing')">release</DotNetFinalVersionKind>
     <!-- Enabling this rule will cause build failures on undocumented public APIs. -->
     <SkipArcadeNoWarnCS1591>true</SkipArcadeNoWarnCS1591>
   </PropertyGroup>