Use RTM version of the SDK (#19130)

NuGet.config

@@ -10,7 +10,6 @@
     <add key="darc-pub-dotnet-aspnetcore-tooling-2dab42e" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-aspnetcore-tooling-2dab42e1/nuget/v3/index.json" />
     <add key="darc-pub-aspnet-Extensions-1286a6f" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-aspnet-Extensions-1286a6ff/nuget/v3/index.json" />
     <!--End: Package sources managed by Dependency Flow automation. Do not edit the sources above.-->
-    <add key="aspnetcore" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/3.1.102-servicing-014873/nuget/v3/index.json" />
     <add key="dotnet-core" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
     <add key="dotnet-tools" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json" />
     <add key="aspnet-blazor" value="https://dotnetfeed.blob.core.windows.net/aspnet-blazor/index.json" />

build.ps1

@@ -362,12 +362,6 @@ try {
 
     $toolsetBuildProj = InitializeToolset
 
-    $dotnetInstallDir = Join-Path $RepoRoot ".dotnet"
-    $sdkPath = [IO.Path]::Combine($dotnetInstallDir, 'sdk', '3.1.102')
-    if (!(Test-Path $sdkPath)) {
-        InstallDotNetSdk $dotnetInstallDir '3.1.102-servicing-014873' -skipNonVersionedFiles $true
-    }
-
     $restore = $tmpRestore
 
     if ($ci) {

build.sh

@@ -316,11 +316,6 @@ restore=true
 
 InitializeToolset
 
-dotnet_install_dir="$repo_root/.dotnet"
-if [[ ! -d "$dotnet_install_dir/sdk/3.1.102" ]]; then
-    InstallDotNetSdk "$dotnet_install_dir" "3.1.102-servicing-014873"
-fi
-
 restore=$_tmp_restore=
 
 if [ "$build_repo_tasks" = true ]; then

global.json

 {
   "sdk": {
-    "version": "3.1.101"
+    "version": "3.1.102"
   },
   "tools": {
-    "dotnet": "3.1.101",
+    "dotnet": "3.1.102",
     "runtimes": {
       "dotnet/x64": [
         "$(MicrosoftNETCoreAppInternalPackageVersion)"