AWS assume the role being provided

[patrickdappollonio]

Description

This PR:

• Finds any default configuration for AWS authentication, including profiles, config files, and keys in environment variables.
• Accepts a new role ARN to assume.
• Verifies if the provided role has the minimum permissions to create clusters.
• Converts the credentials to use the custom role ARN.

Related Issue(s)

Fixes #

How to Test

1. Run aws configure to ensure your AWS credentials are set up correctly for provisioning.
2. Provision a management cluster using the following example command:

   go run . aws create \
     --alerts-email 1@gmail.com \
     --domain-name kubefirst.tech \
     --dns-provider cloudflare \
     --gitops-template-branch main \
     --git-provider gitlab \
     --gitlab-group ar373 \
     --cluster-name rr53