Use real RunningSummarizer in SummaryManager UT to test last summary #7762
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Replacing the mock RunningSummarizer class in this UT with a real one, since RunningSummarizer is where the logic to emit a last summary on summarizer close is located. Also adding a test case involving immediate summary when the ops count is very high (> 10K). This test case is simple; more wrinkled ones will be added when a related bug is fixed.