fix: Improve Errors AWS Errors

[bbernays]

Summary

• Improve Error message when CQ is unable to assume a role in a org member account
• Enable Account and Org to be in same config

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[yevgenypats]

Looks good but I think we need to introduce tests for that both to validate this is correct and also to help with future regression and maybe add docs supporting that

[bbernays]

Looks good but I think we need to introduce tests for that both to validate this is correct and also to help with future regression and maybe add docs supporting that

Great catch. There would have been regressions had this merged with how the STS client is passed around to assume roles. I have updated the PR to explicitly return an error if a user tries to create this specification until we can do a larger refactor.