Don't auto-generated playwright tests in CI

There aren't any auto-generated tests for the playwright feature, as it
depends on the ghcr.io/devcontainers/features/node feature in order to
run.

That feature isn't available in the base image used by auto-generated
tests, so we just can't write any tests in playwright/test.sh.

.github/workflows/test.yaml

@@ -12,8 +12,7 @@ jobs:
     continue-on-error: true
     strategy:
       matrix:
-        features:
-          - playwright
+        features: []
         baseImage:
           - debian:latest
           - ubuntu:latest