feat(github-connector): exclude self-reviews from review counts (#20050)

## Summary

- Adds an `isSelfReview` boolean to the consolidated `PullRequestReview`
record (`true` when the reviewer is the same contributor as the PR
author).
- Filters `isSelfReview === true` rows out of the top-reviewers
leaderboard (`top-contributors`) and per-contributor review stats
(`contributor-stats`) so contributors are credited only for reviews on
**other people's** PRs.
- Both the live ingestion path (`fetch-prs`) and the recompute job
(`recompute-pull-request-reviews`) now thread `prAuthorId` to
`buildConsolidatedRow`, so re-running either is sufficient to backfill
existing rows — no extra migration needed.

## Test plan

- [x] `yarn test
src/modules/github/pull-request-review/utils/consolidate-reviews.integration-test.ts`
— 20 tests passing, including new coverage for the `isSelfReview` helper
and `buildConsolidatedRow` payload.
- [ ] After merge: re-run `fetch-prs` (or
`recompute-pull-request-reviews`) once on a target workspace to backfill
`isSelfReview` on existing `PullRequestReview` rows, then verify the
top-reviewers leaderboard no longer credits self-reviews.


Made with [Cursor](https://cursor.com)

packages/twenty-apps/community/github-connector/src/__tests__/schema.integration-test.ts

@@ -77,6 +77,7 @@ describe('PullRequestReview object', () => {
     expect(names).toContain('firstSubmittedAt');
     expect(names).toContain('lastSubmittedAt');
     expect(names).toContain('eventCount');
+    expect(names).toContain('isSelfReview');
     expect(names).toContain('reviewer');
     expect(names).toContain('pullRequest');
     expect(names).toContain('reviewEvents');