FDR-457 - Do not allow tokens to have more than one assertion for WS-Fed

[adrian-prananda]

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Description

This PR is to validate if we have more than one Assertion inside a token response for WS-Fed. This validation will ensure we're compliant with WS-Trust specs.

References

https://auth0team.atlassian.net/browse/FDR-457

Testing

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• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not the default branch