Better error handling during deploy for valid creds but for a different account

[notgitika]

Description

When you run deploy and you have valid creds but for a different account (not your target for the project)
It starts the deploy properly and the "publish assets" step fails with a generic error.

We should have this check as the first step instead of after doing everything else

Steps to Reproduce

have a different account in aws-targets.json and have valid creds for a separate account.

Expected Behavior

should fail in the first step itselff

Actual Behavior

fails after several steps

CLI Version

0.5.1

Operating System

macOS

Additional Context

No response