feat(ecs): support for explicit activation of the circuit breaker

[badmintoncryer]

This PR has enabled explicit disabling of the circuit breaker.

declare const cluster: ecs.Cluster;
declare const taskDefinition: ecs.TaskDefinition;
const service = new ecs.FargateService(this, 'Service', {
  cluster,
  taskDefinition,
  circuitBreaker: {
    enable: true, // added
    rollback: true
  },
});

This is useful for removing a circuit breaker that has been set previously.

Closes #27131.

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[lpizzinidev]

Looks good overall 👍
Just some minor documentation adjustments.

[badmintoncryer]

@lpizzinidev Thank you for your review and suggestion. I updated documentation.

[paulhcsun]

Overall looks good, just one question about the README.

[paulhcsun]

Is this accurate that omitting the circuitBreaker property will disable the circuit breaker? I believe that was the original issue and I don't think this PR that has directly altered that behaviour.

[badmintoncryer]

I think you're right. It appeared to be an unnecessary detail, so I removed it.

[paulhcsun]

Nice work @badmintoncryer!

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