fix(MAT-273): remove Skyvern (archived) + fix CI test failures

- Remove Skyvern service + DB from docker-compose.yml
- Remove cron/browser_executor.py and pipelines/steps/skyvern.py
- Remove browser_scrape from cron executor dispatch
- Update tests to reflect Skyvern removal
- Fix test_needs_query_rewrite false positive ('das' is a valid trigger)

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

cron/executor.py

@@ -3,14 +3,12 @@
 import logging
 
 from .brave_search import execute_brave_search
-from .browser_executor import execute_browser_scrape
 from .reminder import execute_reminder
 
 logger = logging.getLogger(__name__)
 
 EXECUTORS = {
     "brave_search": execute_brave_search,
-    "browser_scrape": execute_browser_scrape,
     "reminder": execute_reminder,
 }