fix: prevent duplicate middleware registration in ChannelCloudAdapterWithErrorHandlerBase

[LuisM000]

The Microsoft Agents SDK now registers middlewares internally during the CloudAdapter base constructor call. Since ChannelCloudAdapterWithErrorHandlerBase was passing adapterOptions.Middlewares.ToArray() to the base constructor and subclasses were also calling InitializeMiddlewares, middlewares were being registered twice.

Motivation and Context

Upgrading the Microsoft Agents SDK introduced a breaking change in how CloudAdapter handles middlewares internally. Passing the middleware collection to the base constructor caused duplicates when InitializeMiddlewares or InitializeDefaultMiddlewares was subsequently called by subclasses.

The fix passes an empty array to the base constructor instead, preventing the SDK from auto-registering middlewares. Subclasses are now responsible for explicitly calling InitializeDefaultMiddlewares or InitializeMiddlewares in their own constructor to register middlewares in a controlled order.

Type of change

• ✅ The code builds clean without any errors or warnings
• ✅ Bug fix (non-breaking change which fixes an issue)

Checklist

• ✅ My code follows the style guidelines of this project
• ✅ I have performed a self-review of my own code
• ✅ I have commented my code, particularly in hard-to-understand areas
• ✅ My changes generate no new warnings
• ✅ I didn't break anyone 😄