fix(CLI): allow SSO profiles to be used as source profiles (#20340)

SSO profiles can now be used as source profiles.

Fixes #19897.

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: comcalvi

Diff for: packages/aws-cdk/lib/api/aws-auth/aws-sdk-inifile.ts

@@ -132,6 +132,10 @@ export class PatchedSharedIniFileCredentials extends AWS.SharedIniFileCredential
       );
     }
 
+    if (sourceProfileExistanceTest.sso_start_url) {
+      return new AWS.SsoCredentials({ profile: sourceProfile });
+    }
+
     return new AWS.SharedIniFileCredentials(
       (AWS as any).util.merge(this.options || {}, {
         profile: sourceProfile,