Handle SSO urls with ending `#/`

[azatoth]

It's easy to include the #/ ending on the sso url (i.e. https://MYORG.awsapps.com/start#/) when configuring sso in aws, and it's not clear from any error message what's wrong (you'll get "Current cached SSO login is expired or invalid"). Perhaps we could allow for this difference?

[hupe1980]

What exactly do you mean? A better validation of the sso cli profile configuration in the ~/.aws/config file?