Add C# Dev Kit extension to all devcontainer configurations (#119602)

* Initial plan

* Add C# Dev Kit extension to all devcontainer configurations

This change ensures that when creating a new codespace from a PR,
the C# Dev Kit extension (ms-dotnettools.csdevkit) is automatically
installed alongside the basic C# extension, providing a better
development experience with enhanced IntelliSense, debugging,
and project management capabilities.

Co-authored-by: ericstj <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: ericstj <[email protected]>

Author: Copilot

.devcontainer/android/devcontainer.json

@@ -29,7 +29,8 @@
 		"vscode": {
 			// Add the IDs of extensions you want installed when the container is created.
 			"extensions": [
-				"ms-dotnettools.csharp"
+				"ms-dotnettools.csharp",
+				"ms-dotnettools.csdevkit"
 			],
 			"settings": {
 				// Loading projects on demand is better for larger codebases

.devcontainer/devcontainer.json

@@ -23,7 +23,8 @@
 		"vscode": {
 			// Add the IDs of extensions you want installed when the container is created.
 			"extensions": [
-				"ms-dotnettools.csharp"
+				"ms-dotnettools.csharp",
+				"ms-dotnettools.csdevkit"
 			],
 			"settings": {
 				// Loading projects on demand is better for larger codebases

.devcontainer/libraries/devcontainer.json

@@ -23,7 +23,8 @@
 		"vscode": {
 			// Add the IDs of extensions you want installed when the container is created.
 			"extensions": [
-				"ms-dotnettools.csharp"
+				"ms-dotnettools.csharp",
+				"ms-dotnettools.csdevkit"
 			],
 			"settings": {
 				// Loading projects on demand is better for larger codebases

.devcontainer/wasm-multiThreaded/devcontainer.json

@@ -23,7 +23,8 @@
 		"vscode": {
 			// Add the IDs of extensions you want installed when the container is created.
 			"extensions": [
-				"ms-dotnettools.csharp"
+				"ms-dotnettools.csharp",
+				"ms-dotnettools.csdevkit"
 			],
 			"settings": {
 				// Loading projects on demand is better for larger codebases

.devcontainer/wasm/devcontainer.json

@@ -23,7 +23,8 @@
 		"vscode": {
 			// Add the IDs of extensions you want installed when the container is created.
 			"extensions": [
-				"ms-dotnettools.csharp"
+				"ms-dotnettools.csharp",
+				"ms-dotnettools.csdevkit"
 			],
 			"settings": {
 				// Loading projects on demand is better for larger codebases