ci(devcontainer-base): name the full validation gate

Author: robarnold

.github/workflows/image-devcontainer-base.yml

@@ -50,7 +50,7 @@ jobs:
           load: true
           push: false
           tags: ghcr.io/${{ github.repository_owner }}/devcontainer-base:latest
-      - name: Validate Downstream Checks
+      - name: Validate Full CI Pipeline
         uses: devcontainers/ci@513af61f4de4f75d37e4438f184ba4358f0fc1ca # v0.3.1900000450
         with:
           cacheFrom: ghcr.io/marinatedconcrete/config-devcontainer