aws-deployment-framework-base-templates CodeBuild project timeout

## Description

We use a lot of regions and have a lot of accounts. When performing an upgrade you might not have enough time to perform all the necessary steps. For this reason we updated the timeout of the `aws-deployment-framework-base-templates` project from `40` to `240`. But after an hour the temporary credentials expire and the project stops.

## Workaround

Trigger the pipeline again by clicking the "Release" button.

## Solution(s)

There are 2 solutions possible:

* When the credentials almost expire they need to be renewed.
* Replace the whole process with StepFunctions (preferred option as it also includes cost savings)

I know that there are some initiatives to move to StepFunctions already. This is just another reason why it's a good idea.

Start by reviewing the aws-deployment-framework-base-templates CodeBuild project and how its temporary credentials are used during upgrades. Compare credential renewal with the proposed StepFunctions replacement, noting the existing Release-button workaround. Done means a multi-region, multi-account upgrade can run beyond the credential lifetime without stopping.

Written by the indexing model from the issue text.