Reduce allocations from properties dictionary of TestContextImplemention #6364
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On a scenario using 10k tests in a test class, I see:
TestContextImplementation constructor receives already an
IDictionary<string, object?>. However, we clone the dictionary to add 4 more properties to it, without affecting the original dictionary. This causes many allocations. The approach I'm taking here is to create our own dictionary type, which tracks the four extra values we need + the original dictionary. Then, only if the user attempts to mutate the original dictionary, we clone.