Use ContainsKey instead of TryGetValue with discard

Proprietary

When only checking if a key exists, use ContainsKey instead of TryGetValue with a discarded out parameter.

OpenRewrite.Recipes.CSharp.CodeQuality.Performance.FindUseContainsKeyInsteadOfTryGetValue

mod run . --recipe=OpenRewrite.Recipes.CSharp.CodeQuality.Performance.FindUseContainsKeyInsteadOfTryGetValue

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