Add a batch pull mechanism for native mode workers. Instead of each
worker independently polling the DB, a single poller pulls up to N
jobs in one query and dispatches them via an mpsc channel.
- Add `pull_batch()` in windmill-queue with batch SQL query
- Add `run_native_poller()` loop with semaphore-based backpressure
- Workers consume jobs via `try_recv()` on a shared channel
- Detect native mode from both env and DB worker group config
- Add `ScriptLang::tag_str()` to centralize bunnative→nativets mapping
- Fix `add_batch_jobs` tag assignment to use consistent mapping
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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