fix: use uuid_suffix in postgres unique constraint test expectations (#63674)

The test expected SQL without ::UUID type cast for team_id, but
SQLAlchemy v2 generates %(team_id)s::UUID on Postgres. The uuid_suffix
variable was already defined for this purpose but not used.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>