fix: Use only the defined default capacity provider strategies.

[montaguethomas]

Description

An ECS Cluster can have up to 4 default capacity provider strategies. The previous logic would add every capacity provider defined for either EC2 or Fargate. Update the logic to only set a default strategy if the capacity provider sets the default_capacity_provider_strategy map.

Motivation and Context

When using > 4 EC2 ASGs, the module fails due to generating too many default capacity provider strategy rules. Additionally, there can be capacity providers one wouldn't want in the default strategy for a cluster.

Breaking Changes

Only breaks if default_capacity_provider_strategy isn't being set on at least one of the entries in the autoscaling_capacity_providers or fargate_capacity_providers maps.

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects

• I have executed pre-commit run -a on my pull request

[bryantbiggs]

please start with an issue and a reproduction - its not clear what the issue is that we are trying to solve for (if there is in fact an issue)