Find IncrementingPollingCounter async callback change

Proprietary

Finds new IncrementingPollingCounter() constructor calls. In .NET 9, the initial callback invocation is asynchronous instead of synchronous, which may change timing behavior.

OpenRewrite.Recipes.CSharp.Migration.Dotnet.Net9.FindIncrementingPollingCounter
mod run . --recipe=OpenRewrite.Recipes.CSharp.Migration.Dotnet.Net9.FindIncrementingPollingCounter

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