feat: remove dependency on System.Linq.Async

[jskeet]

This avoids a conflict with .NET 10

[gemini-code-assist]

Summary of Changes

Hello @jskeet, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a potential conflict with .NET 10 by eliminating the System.Linq.Async library. The change involves updating project dependencies and refactoring asynchronous iteration patterns in generated code to utilize the built-in await foreach syntax, improving code consistency and reducing external dependencies.

Highlights

• Dependency Removal: The System.Linq.Async dependency has been completely removed from the project, including from Directory.Packages.props and various .csproj files.
• Asynchronous Iteration Update: Generated code snippets have been updated to replace ForEachAsync calls with the native C# await foreach construct for asynchronous iteration, leveraging modern language features.
• Code Generation Logic: The RoslynBuilder and SnippetCodeGenerator have been modified to support the generation of await foreach statements, ensuring future generated code adheres to the new asynchronous iteration pattern.

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[gemini-code-assist]

Code Review

This pull request successfully removes the dependency on System.Linq.Async to avoid potential conflicts with future .NET versions. The implementation correctly replaces ForEachAsync calls with the native await foreach construct, which is a good modernization of the codebase. The code generator and all relevant generated files, including project files and snippets, have been updated consistently. The changes are clean, correct, and well-executed. I have no further comments.

[amanda-tarafa]

Nice!