Update unit tests to factor in the latest SAR updates from last month

[kmcquade]

What does this PR do?

• Update unit tests to factor in the latest SAR updates from last month
• Makes an ARN processing exception more descriptive to assist in IndexError: list index out of range. Please provide a valid ARN. cloudsplaining#229
• Makefile format

Completion checklist

• Additions and changes have unit tests
• Unit tests, Pylint, security testing, and Integration tests are passing.. GitHub actions does this automatically
• The pull request has been appropriately labeled using the provided PR labels

[salesforce-cla]

Thanks for the contribution! Unfortunately we can't verify the commit author(s): Kinnaird Mcquade <k***@s***.com>. One possible solution is to add that email to your GitHub account. Alternatively you can change your commits to another email and force push the change. After getting your commits associated with your GitHub account, sign the Salesforce.com Contributor License Agreement and this Pull Request will be revalidated.

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @kmcquade to sign the Salesforce.com Contributor License Agreement.