Use dev 9.0 image which contains GA bits. (#6726)

* Use dev 9.0 image which contains GA bits.

* Add node and python features for debugging them in the repo.

.devcontainer/devcontainer.json

@@ -3,7 +3,7 @@
 {
 	"name": "C# (.NET)",
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"image": "mcr.microsoft.com/devcontainers/dotnet:1-9.0-bookworm",
+	"image": "mcr.microsoft.com/devcontainers/dotnet:dev-9.0-bookworm",
 	"features": {
 		"ghcr.io/devcontainers/features/azure-cli:1": {},
 		"ghcr.io/azure/azure-dev/azd:0": {},
@@ -14,6 +14,8 @@
 				"8.0.403"
 			]
 		},
+    "ghcr.io/devcontainers/features/node:1": {},
+    "ghcr.io/devcontainers/features/python:1": {},
 		"ghcr.io/dapr/cli/dapr-cli": {
 			"version": "1.12.0"
 		}