Move blocked_status_codes from Session to the crawler #2139

Blocked status codes are configured per Session (src/crawlee/sessions/_session.py), even though deciding whether a response means "blocked" is the crawler's concern - and the crawler already owns additional_http_error_status_codes and ignore_http_error_status_codes. Move it to a crawler option and keep the handling internal to the crawler.

JS implementation: apify/crawlee#3496

This will be a breaking change.

✍️ Drafted by Claude Code