fix: use iamHost property in federated auth and okta plugins

[aaron-congo]

Description

This PR changes the federated authentication and okta authentication plugins to use the user provided iamHost property when generating authentication tokens. Prior to this change, the URL host was being used regardless of what iamHost was set to.

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

[github-actions]

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It seems all right 👌

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