Provide an option to enable ECS Exec for Fargate deployments

I deployed an application to Fargate. Then I wanted to run ECS Exec against the running service/task. It turns out I would have to make adjustments to my running resources through the AWS CLI (and to the Task role) in order to enable running ECS Exec commands.

**Describe the solution you'd like**

When I deploy to Fargate, it would be great if I had the option to enable ECS Exec support.

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This is a :rocket: feature request

The issue does not name files, tests, or an entry point. Start by locating the Fargate deployment path and its task-role configuration, then determine where an ECS Exec option belongs. Done means a deployment can enable ECS Exec without manual AWS CLI or task-role adjustments, with verification against the deployed service or task.

Written by the indexing model from the issue text.