.Net: Prepare code for A2A SDK and AsyncEnumerable NuGet update #12842
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Motivation, Context and Description
This PR prepares the SK codebase for a future update of the A2A agent to the new A2A .NET SDK and establishes the foundation for easy adoption of the System.Linq.AsyncEnumerable package when it released. This will completely eliminate the need for the AsyncEnumerable polyfills that SK currently uses.
As part of this preparation, this PR stops using of the System.Linq.Async package and replaces all SK calls to its APIs with either equivalent calls to the AsyncEnumerable polyfills or in-place implementations. This prevents "The call is ambiguous between..." name conflicts that would occur when the AsyncEnumerable APIs from the A2A .NET SDK's transitive dependency (System.Linq.AsyncEnumerable) become available to the Agents.UnitTests project, which already contains equivalent APIs from either AsyncEnumerable polyfills and/or the System.Linq.Async package brought in from other projects that have the Agents.UnitTests project specified as "InternalVisibleTo".
As a result, almost all non-production code (tests and samples) uses AsyncEnumerable APIs from the preview version of the System.Linq.AsyncEnumerable package, while production code uses either AsyncEnumerable APIs from polyfills or uses in-place implementations.