15 Minute Token Time out at AWS Shell Script task

**Describe the bug**
When running the [AWS Shell Script task](https://docs.aws.amazon.com/de_de/vsts/latest/userguide/awsshell.html) after 15 Minutes the calls will abort because of the End of Life of the Token.

**To reproduce**
Build pipeline with an [AWS Shell Script task](https://docs.aws.amazon.com/de_de/vsts/latest/userguide/awsshell.html).
in this task make a loop that makes a call every minute with the cli and the call after 15 Minutes will throw a Time out (The security token included in the request is expired)

**Expected behavior**
The Token exiration period is longer than 15 Minutes or it can be set in the Task.

**Your Environment**

- On-prem or cloud based?: cloud Based
- Azure DevOps version: latest
- AWS Toolkit for Azure DevOps version: latest

Start at the AWS Shell Script task and reproduce the pipeline loop described in the issue, using the linked AWS documentation for task context. Trace where the task obtains and reuses its token; done means calls continuing past 15 minutes no longer fail, or the task exposes the requested token-duration setting.

Written by the indexing model from the issue text.