feat(secops): add watchlist management tools

[mihirvala08]

Summary

Added Watchlist Management tools to SecOps MCP for Chronicle SIEM, enabling AI-assisted entity risk scoring and watchlist lifecycle management.

What

Added 5 Chronicle SIEM Watchlist Management tools:

• create_watchlist - Create new watchlist with risk multiplier
• update_watchlist - Update watchlist properties (display name, description, risk multiplier, entity population mechanism, user preferences)
• delete_watchlist - Delete watchlist by ID with force option
• get_watchlist - Retrieve watchlist details and configuration
• list_watchlists - List all watchlists with pagination support

Changelog

• server/secops/secops_mcp/tools/watchlist_management.py: Added watchlist management tools for creating, updating, deleting, retrieving, and listing watchlists with comprehensive documentation and error handling
• server/secops/secops_mcp/tools/__init__.py Added import for watchlist management tools
• server/secops/tests/test_secops_watchlist_mcp.py: Integration tests for watchlist management tools covering full lifecycle (create, update, delete) and read operations (list, get) with real Chronicle API calls

Testing

• 4 integration test methods covering all 5 tools
• Full lifecycle test with create → update → delete workflow
• Cleanup logic in finally blocks to prevent test data pollution
• Skips gracefully when no watchlists available

[dandye]

Integration Test Evidence

list_watchlists

get_watchlist

update_watchlist

[dandye]

Test evidence in the comments. Nice work, @mihirvala08 !

Signed-off-by: @dandye