Update CentOS Stream 8 -> 9 (#15789)

Author: richlander

eng/common/templates-official/jobs/source-build.yml

@@ -14,7 +14,7 @@ parameters:
   # This is the default platform provided by Arcade, intended for use by a managed-only repo.
   defaultManagedPlatform:
     name: 'Managed'
-    container: 'mcr.microsoft.com/dotnet-buildtools/prereqs:centos-stream8'
+    container: 'mcr.microsoft.com/dotnet-buildtools/prereqs:centos-stream-9-amd64'
 
   # Defines the platforms on which to run build jobs. One job is created for each platform, and the
   # object in this array is sent to the job template as 'platform'. If no platforms are specified,

eng/common/templates/jobs/source-build.yml

@@ -14,7 +14,7 @@ parameters:
   # This is the default platform provided by Arcade, intended for use by a managed-only repo.
   defaultManagedPlatform:
     name: 'Managed'
-    container: 'mcr.microsoft.com/dotnet-buildtools/prereqs:centos-stream8'
+    container: 'mcr.microsoft.com/dotnet-buildtools/prereqs:centos-stream-9-amd64'
 
   # Defines the platforms on which to run build jobs. One job is created for each platform, and the
   # object in this array is sent to the job template as 'platform'. If no platforms are specified,

tests/UnitTests.proj

@@ -59,7 +59,7 @@
   </ItemGroup>
 
   <ItemGroup Condition=" '$(HelixAccessToken)' != '' ">
-    <HelixTargetQueue Include="(Centos.8.Amd64)Ubuntu.2204.Amd64@mcr.microsoft.com/dotnet-buildtools/prereqs:centos-stream8-helix"/>
+    <HelixTargetQueue Include="(Centos.9.Amd64)Ubuntu.2204.Amd64@mcr.microsoft.com/dotnet-buildtools/prereqs:centos-stream-9-helix-amd64"/>
     <HelixTargetQueue Include="Windows.10.Amd64"/>
     <HelixTargetQueue Include="(Debian.12.Amd64)ubuntu.2204.amd64@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-12-helix-amd64"/>
   </ItemGroup>
@@ -71,7 +71,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition=" '$(HelixAccessToken)' == '' ">
-    <HelixTargetQueue Include="(Centos.8.Amd64.Open)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:centos-stream8-helix"/>
+    <HelixTargetQueue Include="(Centos.9.Amd64.Open)Ubuntu.2204.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:centos-stream-9-helix-amd64"/>
     <HelixTargetQueue Include="Windows.10.Amd64.Open"/>
     <HelixTargetQueue Include="(Debian.12.Amd64.Open)ubuntu.2204.amd64.open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-12-helix-amd64"/>
   </ItemGroup>