Merged PR 55161: Prep for 308 hotfix by removing vssdk feeds

Update branding
downgrade implicit version
Remove vssdk feeds

----
#### AI description  (iteration 1)
#### PR Classification
This pull request prepares the repository for the 308 hotfix by updating configuration and version properties.

#### PR Summary
The update adjusts key configuration files to align with the new hotfix release requirements.
- **`NuGet.config`**: Removed the "vssdk" and "vssdk-archived" package sources.
- **`eng/Versions.props`**: Updated `<VersionFeature>` from "07" to "08" and modified `<VersionFeature80>` from adding 15 to adding 14.
<!-- GitOpsUserAgent=GitOps.Apps.Server.pullrequestcopilot -->

Author: marcpopMSFT

NuGet.config

@@ -60,8 +60,6 @@
     <add key="dotnet-tools-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools-transport/nuget/v3/index.json" />
     <add key="dotnet-libraries" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-libraries/nuget/v3/index.json" />
     <add key="dotnet-libraries-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-libraries-transport/nuget/v3/index.json" />
-    <add key="vssdk" value="https://pkgs.dev.azure.com/azure-public/vside/_packaging/vssdk/nuget/v3/index.json" />
-    <add key="vssdk-archived" value="https://pkgs.dev.azure.com/azure-public/vside/_packaging/vssdk-archived/nuget/v3/index.json" />
     <add key="vs-impl" value="https://pkgs.dev.azure.com/azure-public/vside/_packaging/vs-impl/nuget/v3/index.json" />
     <!-- Used for Rich Navigation indexing task -->
     <add key="richnav" value="https://pkgs.dev.azure.com/azure-public/vside/_packaging/vs-buildservices/nuget/v3/index.json" />

eng/Versions.props

@@ -6,7 +6,7 @@
     <VersionMajor>9</VersionMajor>
     <VersionMinor>0</VersionMinor>
     <VersionSDKMinor>3</VersionSDKMinor>
-    <VersionFeature>07</VersionFeature>
+    <VersionFeature>08</VersionFeature>
     <!-- This property powers the SdkAnalysisLevel property in end-user MSBuild code.
          It should always be the hundreds-value of the current SDK version, never any
          preview version components or anything else. E.g. 8.0.100, 9.0.300, etc. -->
@@ -35,7 +35,7 @@
     <VersionFeature50>17</VersionFeature50>
     <VersionFeature60>36</VersionFeature60>
     <VersionFeature70>20</VersionFeature70>
-    <VersionFeature80>$([MSBuild]::Add($(VersionFeature), 15))</VersionFeature80>
+    <VersionFeature80>$([MSBuild]::Add($(VersionFeature), 14))</VersionFeature80>
     <!-- Should be kept in sync with VersionFeature70. It should match the version of Microsoft.NET.ILLink.Tasks
          referenced by the same 7.0 SDK that references the 7.0.VersionFeature70 runtime pack. -->
     <_NET70ILLinkPackVersion>7.0.100-1.23211.1</_NET70ILLinkPackVersion>
@@ -184,7 +184,7 @@
          Additionally, set the MinimumVSVersion for the installer UI that's required for targeting NetCurrent -->
     <MicrosoftBuildVersion>17.14.28</MicrosoftBuildVersion>
     <MicrosoftBuildLocalizationVersion>17.14.28-servicing-25466-01</MicrosoftBuildLocalizationVersion>
-    <MicrosoftBuildMinimumVersion Condition="'$(DotNetBuildSourceOnly)' != 'true'">17.11.31</MicrosoftBuildMinimumVersion>
+    <MicrosoftBuildMinimumVersion Condition="'$(DotNetBuildSourceOnly)' != 'true'">17.11.48</MicrosoftBuildMinimumVersion>
     <MinimumVSVersion>17.12</MinimumVSVersion>
   </PropertyGroup>
   <PropertyGroup>

test/TestAssets/Directory.Build.props

@@ -5,6 +5,7 @@
     <ManagePackageVersionsCentrally>false</ManagePackageVersionsCentrally>
     <CheckEolTargetFramework>false</CheckEolTargetFramework>
     <DefaultItemExcludes>$(DefaultItemExcludes);**/*.tmp</DefaultItemExcludes>
+    <NuGetAudit>false</NuGetAudit> 
   </PropertyGroup>
 
 </Project>