[ECS] [Feature Request]: Increase Capacity Provider limit and make configurable via Service Quotas

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**Tell us about your request**
We would like the ability to increase the number of ECS Capacity Providers per Region beyond the current hard limit of 20, and ideally make it configurable through AWS Service Quotas.

**Which service(s) is this request for?**
Amazon ECS (Capacity Providers)

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
The current hard limit of 20 Capacity Providers per Region restricts scaling patterns for large or multi-tenant ECS environments.
Organizations that operate multiple clusters or use separate Capacity Providers for different workloads, accounts, or tenants may reach this limit quickly.
This limitation reduces flexibility in how compute environments can be isolated or managed and increases operational overhead for teams managing numerous clusters or services.

**Are you currently working around this issue?**
Workarounds include reusing Capacity Providers across workloads or consolidating services into fewer clusters.
Another option is to open a support ticket to request a limit increase. This process can take time for review and approval, and in some cases the request may be denied.
These approaches can introduce complexity, reduce fault isolation, and create scaling or governance challenges in larger deployments

**Additional context**
- Request to make this limit adjustable via AWS Service Quotas or raise the default limit to better support large or multi-tenant deployments.
- Current documented limit: 20 Capacity Providers per Region (not adjustable)
Reference: https://docs.aws.amazon.com/general/latest/gr/ecs-service.html#limits_ecs

**Attachments**
N/A

Start with the ECS service-limits documentation linked in the issue and the AWS Service Quotas integration; no repository files, tests, or entry points are identified. Confirm with the owning AWS service whether the Capacity Provider limit can be raised or exposed as an adjustable quota. Done means the requested regional limit behavior is implemented and documented.

Written by the indexing model from the issue text.