[#6825] Fix Microsoft.Bcl.AsyncInterfaces warnings

[sw-joelmut]

Addresses #6825

minor

Description

This PR adds the Microsoft.Bcl.AsyncInterfaces package to Microsoft.Bot.Builder.Azure project, forcing 1.x version to 8.x, solving the MSB3277 warnings.

Specific Changes

• Added Microsoft.Bcl.AsyncInterfaces to Microsoft.Bot.Builder.Azure project, forcing to use 8.x version instead of 1.x that caused the conflict.
• Updated System.Diagnostics.DiagnosticSource in Microsoft.Bot.Builder.Integration.ApplicationInsights.WebApi project, solving MSB3245 warning.

Testing

The following images show the CI pipeline, and the reduction of the warnings.

[BruceHaley]

:heavy_check_mark: No Binary Compatibility issues for Microsoft.Bot.Builder.Azure.dll