[ECS-Plugin]: Supporting native ECS Controller

What would you like to be added:

Add support for the native ECS deployment controller in the pipedv1 ECS plugin. Currently the plugin only supports EXTERNAL deployment controller (task-set based).

This feature will enable ECS-native rolling updates, blue/green deployments, linear, and canary strategies driven by ECS itself.

Why is this needed:

1. Users want native ECS strategies
2. ECS-native blue/green, lifecycle hooks, and failure detection were launched mid-2025 but users adopting these AWS features cannot use PipeCD at all
3. Service Connect canary/blue-green is impossible with EXTERNAL (task sets don't support it). It works natively with the ECS controller
4. Simpler pipeline