Another round of db.DefaultContext refactor (#27103)

Part of #27065

---------

Co-authored-by: KN4CK3R <admin@oldschoolhack.me>

models/issues/pull.go

@@ -311,7 +311,7 @@ func (pr *PullRequest) LoadRequestedReviewers(ctx context.Context) error {
 		return nil
 	}
 
-	reviews, err := GetReviewsByIssueID(pr.Issue.ID)
+	reviews, err := GetReviewsByIssueID(ctx, pr.Issue.ID)
 	if err != nil {
 		return err
 	}