fix: strict saml-schema-protocol-2.0.xsd compat

[rotarydrone]

Recently observed a rare case where saml-schema-protocol-2.0.xsd was strictly enforced by the SP, causing the forged assertion to be rejected. this is due to ordering of the XML elements. should be Issuer -> Signature -> Subject.

This PR restructures the XML to be strictly compatible with saml-schema-protocol-2.0.xsd.

Test an assertion here before and after: https://www.samltool.com/validate_xml.php

[sonarqubecloud]

Quality Gate failed

Failed conditions
1 Security Hotspot
D Maintainability Rating on New Code (required ≥ A)

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