[transferwebhooks] Code generation: update services and models

[AdyenAutomationBot]

This PR contains the automated changes for the transferwebhooks service.

The commit history of this PR reflects the adyen-openapi commits that have been applied.

[gemini-code-assist]

Code Review

This pull request introduces tracing data models (UKFpsTracingData, USAchTracingData, TransferDataTracing, TransferEventTracingData, and NetworkReason) and registers their JSON converters to support UK FPS and US ACH network tracing. It also removes deprecated advice statuses from several models. The review feedback highlights that the required discriminator Type properties in UKFpsTracingData and USAchTracingData should be initialized by default to prevent serialization failures. Additionally, several auto-generated JSON converters assign nullable strings to non-nullable variables, which triggers CS8600 compiler warnings under #nullable enable and should be resolved.

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[gemini-code-assist]

The Type property is a required discriminator field but is not initialized by default. When serializing UKFpsTracingData, if the user does not manually set this property, the "type" field will be omitted from the JSON payload, causing deserialization to fail on the receiver's end. It should be initialized to TypeEnum.UkFps by default.

        public TypeEnum Type { get; set; } = TypeEnum.UkFps;

[gemini-code-assist]

The Type property is a required discriminator field but is not initialized by default. When serializing USAchTracingData, if the user does not manually set this property, the "type" field will be omitted from the JSON payload, causing deserialization to fail on the receiver's end. It should be initialized to TypeEnum.UsAch by default.

        public TypeEnum Type { get; set; } = TypeEnum.UsAch;

[gemini-code-assist]

Under #nullable enable, reader.GetString() returns a nullable string (string?). Assigning it to a non-nullable string variable will trigger a compiler warning (CS8600). Change the variable type to string? to make the code warning-free.

                    string? value = reader.GetString();

[gemini-code-assist]

Under #nullable enable, reader.GetString() returns a nullable string (string?). Assigning it to a non-nullable string variable will trigger a compiler warning (CS8600). Change the variable type to string? to make the code warning-free.

                    string? value = reader.GetString();

[gemini-code-assist]

Under #nullable enable, reader.GetString() returns a nullable string (string?). Assigning it to a non-nullable string variable will trigger a compiler warning (CS8600). Change the variable type to string? to make the code warning-free.

                    string? value = reader.GetString();

[gemini-code-assist]

Under #nullable enable, reader.GetString() returns a nullable string (string?). Assigning it to a non-nullable string variable will trigger a compiler warning (CS8600). Change the variable type to string? to make the code warning-free.

                    string? value = reader.GetString();

[gemini-code-assist]

Under #nullable enable, reader.GetString() returns a nullable string (string?). Assigning it to a non-nullable string variable will trigger a compiler warning (CS8600). Change the variable type to string? to make the code warning-free.

                    string? value = reader.GetString();