Disable PR test runs while in draft

Author: Ariouz

.github/workflows/ci-matrix-gen.yml

@@ -8,6 +8,7 @@ on:
         description: Job selection (Python regex)
         required: false
   pull_request:
+    types: [review_requested, ready_for_review]
   schedule:
     - cron: '0 0 * * 1'