[release/9.0] Stable branding for GA (#108899)

* [release/9.0] Stable branding for GA

* Make VerifyFrameworkDescriptionContainsCorrectVersion test more specific in its checks when stable.

* Revert "Make VerifyFrameworkDescriptionContainsCorrectVersion test more specific in its checks when stable."

This reverts commit 2dd6cd4.

* Fix InformationalVersion in corelib generators

---------

Co-authored-by: Alexander Köplinger <alex.koeplinger@outlook.com>

eng/Versions.props

@@ -14,7 +14,7 @@
     <PreReleaseVersionIteration>
     </PreReleaseVersionIteration>
     <!-- Enable to remove prerelease label. -->
-    <StabilizePackageVersion Condition="'$(StabilizePackageVersion)' == ''">false</StabilizePackageVersion>
+    <StabilizePackageVersion Condition="'$(StabilizePackageVersion)' == ''">true</StabilizePackageVersion>
     <DotNetFinalVersionKind Condition="'$(StabilizePackageVersion)' == 'true'">release</DotNetFinalVersionKind>
     <WorkloadVersionSuffix Condition="'$(DotNetFinalVersionKind)' != 'release' and '$(PreReleaseVersionIteration)' == '' and '$(PreReleaseVersionLabel)' != 'rtm'">-$(PreReleaseVersionLabel)</WorkloadVersionSuffix>
     <WorkloadVersionSuffix Condition="'$(WorkloadVersionSuffix)' == '' and '$(DotNetFinalVersionKind)' != 'release' and '$(PreReleaseVersionLabel)' != 'rtm'">-$(PreReleaseVersionLabel).$(PreReleaseVersionIteration)</WorkloadVersionSuffix>

src/libraries/System.Private.CoreLib/gen/System.Private.CoreLib.Generators.csproj

@@ -2,6 +2,9 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <NoWarn>$(NoWarn);CS3001</NoWarn>
+    <!-- Override InformationalVersion during servicing as it's returned via public api. -->
+    <InformationalVersion Condition="'$(PreReleaseVersionLabel)' == 'servicing'">$(ProductVersion)</InformationalVersion>
+    <InformationalVersion Condition="'$(StabilizePackageVersion)' == 'true'">$(ProductVersion)</InformationalVersion>
   </PropertyGroup>
 
   <ItemGroup>