Add handled_check_limit property to IDV sandbox check configurations

[Copilot]

Implements handled_check_limit property for IDV sandbox check configurations to control the number of handled/failure responses before switching to success.

Changes

• Base Configuration: Added handled_check_limit property to RequestedCheckConfig with JSON serialization configured to omit null values
• Config Classes: Updated constructors for all 9 check config types to accept optional handledCheckLimit parameter:
  • RequestedDocumentAuthenticityConfig
  • RequestedFaceComparisonConfig, RequestedFaceMatchConfig
  • RequestedIdDocumentComparisonConfig
  • RequestedLivenessConfig
  • RequestedThirdPartyIdentityConfig
  • RequestedWatchlistScreeningConfig
  • RequestedWatchlistAdvancedCaConfigYotiAccount, RequestedWatchlistAdvancedCaConfigCustomAccount
• Builder Classes: Added WithHandledCheckLimit(int) fluent method to all corresponding builder classes
• Tests: Added unit and serialization tests covering property behavior and JSON round-trip

Usage

var check = new RequestedDocumentAuthenticityCheckBuilder()
    .WithManualCheckNever()
    .WithHandledCheckLimit(3)  // Return handled result 3 times before success
    .Build();

Serializes to JSON as:

{
  "type": "ID_DOCUMENT_AUTHENTICITY",
  "config": {
    "manual_check": "NEVER",
    "handled_check_limit": 3
  }
}

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