Add IoTFirmwareDefense 2026-06-01-preview API version (#45718)

* Add IoTFirmwareDefense 2026-06-01-preview API version with UnsafeFunctionCalls resource

- Add new preview API version 2026-06-01-preview
- Add UnsafeFunctionCallsResource.tsp with listByFirmware operation
- Add FunctionCall, UnsafeFunctionCallsResult, UnsafeFunctionCallsSummaryResource models
- Add SummaryType.UnsafeFunctionCalls union member
- Add @clientName(GenerateUploadUrlContent, csharp) to GenerateUploadUrlRequest
- Sync tspconfig.yaml and generated swagger/examples

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Authored-by: Jillian Penfield <jpenfield@microsoft.com>