ci: skip AI review for draft PRs

Previously, the Claude Code PR Review workflow would run on all PRs
including drafts. This wastes resources since draft PRs are still
work-in-progress and not ready for review.

Add a condition to skip the workflow when the PR is in draft state.
The workflow will still run when the PR is marked ready for review
via the ready_for_review event trigger.

Release note: None
Epic: None

Author: ajstorm

.github/workflows/pr-analyzer-threestage.yml

@@ -8,7 +8,7 @@ jobs:
   claude-code-pr-review:
     runs-on: ubuntu-latest
     timeout-minutes: 60
-    if: "!startsWith(github.base_ref, 'release-') && !contains(github.event.pull_request.labels.*.name, 'O-No-AI-Review') && github.event.pull_request.merged == false"
+    if: "!startsWith(github.base_ref, 'release-') && !contains(github.event.pull_request.labels.*.name, 'O-No-AI-Review') && !github.event.pull_request.merged && !github.event.pull_request.draft"
     permissions:
       contents: read
       pull-requests: write