Revert dictionary clone helper logic

[MaggieKimani1]

Reverts the DictionaryCloneHelper logic for cloning dictionaries in order to unblock Kiota. This fix was a result of this issue which introduced this bug that is blocking Kiota. Since DeX API has a Cloning workaround, I've reverted this logic for us to unblock Kiota as we take more time to investigate on how to prevent the StackOverflow exception generated as a result of circular object dependencies when cloning an OpenApiDocument.

Example:

System.Text.Json.JsonException : A possible object cycle was detected. This can either be due to a cycle or if the object depth is larger than the maximum allowed depth of 64. Consider using ReferenceHandler.Preserve on JsonSerializerOptions to support cycles.
Path: $.Operations.Responses.Content.Schema.AllOf.Reference.HostDocument.Paths.Operations.Responses.Content.Schema.AllOf.Reference.HostDocument.Paths.Operations.Responses.Content.Schema.AllOf.Reference.HostDocument.Paths.Operations.Responses.Content.Schema.AllOf.Reference.HostDocument.Paths.Operations.Responses.Content.Schema.AllOf.Properties.Type.

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