feat(ecs): ExternalService support daemon scheduling strategy (#32630)

### Issue # (if applicable)

Closes #32538

### Description of changes
- ECS `ExternalService` support `daemon` scheduling strategy

### Description of how you validated changes
Unit test

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

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Author: phuhung273