test: remove crawler integration tests that only test Crawlee features

These tests (max_crawl_depth, max_requests_per_crawl, max_request_retries)
only exercise Crawlee functionality and don't test any Apify SDK integration.
Crawlee is responsible for testing its own features.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: vdusek