Parameterize route correction search depth to avoid infinite loops

[riron1206]

Summary

Addressed an issue where route_roadblock_correction would hang or take an excessive amount of time due to BFS search on certain maps.
This PR makes the search depth limits (search_depth_backward, search_depth_forward) configurable via Hydra config, allowing users to reduce the search space and avoid infinite loops.

Changes

1. Configuration: Added pdm_search_depth_backward and pdm_search_depth_forward to default_metric_caching.yaml (defaults kept at 15 and 30).
2. Parameter Propagation: Updated constructors and method calls in MetricCacheProcessor, PDMClosedPlanner, AbstractPDMClosedPlanner, and AbstractPDMPlanner to propagate these parameters down to route_utils.
3. Bug Fix: Fixed a bug in AbstractPDMClosedPlanner where arguments were not passed to super().__init__.

Impact

• PDM Planner related classes in navsim/planning.
• Metric caching execution flow.
• No behavioral change if default values are used. Lower values can prevent hang-ups and reduce computation time.