ARROW-12220: [C++][CI] Thread sanitizer failure#9941

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westonpace wants to merge 7 commits intoapache:masterfrom

westonpace:bugfix/arrow-12220

Commits on Apr 12, 2021

ARROW-12220: The background generator kept reading from the source even after the downstream had given up on it. Other than the obvious memory / resource usage problems this also meant that callba…
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ARROW-12220: The previous fix didn't properly consider all cases and could lead to deadlock.
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ARROW-12220: Lint
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ARROW-12220: Need to be a little more lenient in unit tests. Slow PCs could fail to cleanup the background thread quickly enough for the unit test's satisfaction
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ARROW-12220: Based on PR feedback I am attempting to simplify things and reduce race conditions
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ARROW-12220: Forgot to remove an enum leftover from a failed approach
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ARROW-12220: Moved Task to a static method on BackgroundGenerator
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