.github/workflows: skip draft PRs for request review workflows

Skip the "request review" workflows for PRs that are in draft to reduce
noise / skip adding reviewers to PRs that are intentionally marked as
not ready to review.

Updates #cleanup

Signed-off-by: Mario Minardi <mario@tailscale.com>

.github/workflows/request-dataplane-review.yml

@@ -2,6 +2,7 @@ name: request-dataplane-review
 
 on:
   pull_request:
+    types: [ opened, synchronize, reopened, ready_for_review ]
     paths:
       - ".github/workflows/request-dataplane-review.yml"
       - "**/*derp*"
@@ -10,6 +11,7 @@ on:
 
 jobs:
   request-dataplane-review:
+    if: github.event.pull_request.draft == false
     name: Request Dataplane Review
     runs-on: ubuntu-latest
     steps: