Update .NET SDK version in global.json (#13007)

* Update .NET SDK version in global.json

Fixes #13006

* Update copilot instructions

Author: sebastienros

.github/copilot-instructions.md

@@ -14,7 +14,7 @@
 - **Project Templates**: Starter templates for new Aspire applications
 
 ### Technology Stack
-- .NET 10.0 RC (specified in global.json)
+- .NET 10.0
 - C# 13 preview features
 - xUnit SDK v3 with Microsoft.Testing.Platform for testing
 - Microsoft.DotNet.Arcade.Sdk for build infrastructure
@@ -133,7 +133,7 @@ These switches can be repeated to run tests on multiple classes or methods at on
 - **`/extension`**: VS Code extension source code
 
 ### Key Configuration Files
-- **`global.json`**: Pins .NET SDK version (10.0.100-rc.1.25411.109) - never modify without explicit request
+- **`global.json`**: Pins .NET SDK version - never modify without explicit request
 - **`.editorconfig`**: Code formatting rules, null annotations, diagnostic configurations
 - **`Directory.Build.props`**: Shared MSBuild properties across all projects
 - **`Directory.Packages.props`**: Centralized package version management

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "10.0.100-rc.2.25502.107",
+    "version": "10.0.100",
     "rollForward": "major",
     "allowPrerelease": true,
     "paths": [
@@ -10,7 +10,7 @@
     "errorMessage": "The .NET SDK could not be found. Run ./restore.sh (Linux/macOS) or ./restore.cmd (Windows) to install the local SDK."
   },
   "tools": {
-    "dotnet": "10.0.100-rc.2.25502.107",
+    "dotnet": "10.0.100",
     "runtimes": {
       "dotnet/x64": [
         "$(DotNetRuntimePreviousVersionForTesting)",