fix: Can't use a profile that used aws login for temporary credentials (closes #3300)

[sseshachala]

Fixes #3300

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[stobrien89]

Closing for the same reason as #3304: loadRoleProfile() is the role-assumption code path and is not part of the login credential provider. Per the cross-SDK Login Credentials Provider specification, login_session is defined only as a key on the resolved profile in the default credentials chain. It is not consulted via source_profile. Same for sso_session / sso_start_url per the SSO spec. See the linked issue for the supported configuration and a broader explanation.