Add SyndicatedRegistries to registries.json

[gfitzgerald42]

ARM (Control Plane) API Specification Update Pull Request

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Generated ApiView

Language	Package Name	ApiView Link
Go	sdk/resourcemanager/machinelearning/armmachinelearning	https://apiview.dev/Assemblies/Review/c19328b4fc084461adfa498aa764be2f?revisionId=ad33830b52964ee7ac3d399c50d15072
JavaScript	@azure/arm-machinelearning	https://apiview.dev/Assemblies/Review/4b0822cc790d43b3b46bc9b075044246?revisionId=62327eddd2e84360ad03a3fc171b9d6c
.Net	Azure.ResourceManager.MachineLearning	https://apiview.dev/Assemblies/Review/b3a1424a42c346a8906822f457909b53?revisionId=ba182e7d5bc4439792f98deeb45e2b11

[azure-sdk]

API change check

APIView has identified API level changes in this PR and created following API reviews.

Microsoft.MachineLearningServices

[gfitzgerald42]

Looking` to add a new field that matches this structure:

`public Dictionary<Guid, SyndicatedRegistry> SyndicatedRegistries { get; set; }

public class SyndicatedRegistry { public Guid RegistryId { get; set; } }`

[chaoyu-msft]

please add this to the preview-10-01 section too.

[chaoyu-msft]

/azp run

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