[ECS Fargate] [request]: Expose docker pull times

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**Tell us about your request**
I would like to have information about the docker pull/extract times, and (for Windows specifically) the layers that were cached on the host. With this information we can monitor and optimize ECS Fargate start times.

**Which service(s) is this request for?**
This could be Fargate

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
Though valid for all types of containers, specifically with Windows containers or other large images (like AI/ML), having real world metrics of pull times would enable a platform team to help developers optimize their docker images

**Are you currently working around this issue?**
Ensure images are small, local testing, ensure images are up to date (windows) so cached layers are used

The issue names ECS Fargate and Docker pull/extract times but does not identify repository files, tests, or an implementation entry point. Start by locating the Fargate metrics or telemetry components; done means exposing pull and extraction timing, plus cached Windows layer information, in a usable form for monitoring start times.

Written by the indexing model from the issue text.