Allow ecs exec to be enabled for the task.

[jamesiarmes]

What it solves

We have a workflow that launches a container for debugging within our service. Often, during development at leasr, we'll find ourselves needing to open a session to the container. This PR allows enabling command execution on the task.

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request
• Pull request title is brief and descriptive (for a changelog entry)

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, or enhancement
• Label as bump:patch, bump:minor, or bump:major if this PR should create a new release