chore: tune coderabbit config (#2687)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
* Added/updated automated pull-request review configuration: auto-review
for draft PRs, automatic conventional-commit-style titles, stricter
summary formatting and issue-reference requirements, enabled
request-changes workflow, and marks commits as failing when checks don't
pass.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: ssbarnea

.coderabbit.yaml

@@ -0,0 +1,15 @@
+reviews:
+  auto_review:
+    enabled: true
+    drafts: true
+  auto_title_instructions: Use conventional commits structure
+  fail_commit_status: true
+  high_level_summary_instructions: |
+    Describe the main change in the pull request in 60 words max. Explain what was changed, why it was needed, and the approach taken.
+    Use single level bullet points to list individual changes.
+    Include a plain-text issue reference line using one of the formats `fixes: #<issue_number>`, `closes: #<issue_number>`, or `related: #<issue_number|AAP-number>`.
+    Do not include full or partial URLs for these issue references.
+    The summary must not start with any heading or title.
+  in_progress_fortune: false
+  request_changes_workflow: true
+  review_status: false