Decrypt token: Remove exceptions + use new ValidationParameters

[iNinja]

Decrypt token: Remove exceptions + use new ValidationParameters

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Description

• Added new TokenDecryptingResult
• Added missing delegate for ValidateAlgorithm
• Updated ValidationParameters to provide the delegates required for token decryption
• Refactored DecryptToken method and dependencies to not throw exceptions and return result type.

Raising this as a draft PR to discuss the approach and validate the plan.
I will add tests before making it official.

Part of #2711.