Fix WriteAsyncCancelledFile test failure - #56895

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adamsitnik wants to merge 3 commits into

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adamsitnik:issue56894

Commits on Aug 5, 2021

use Interlocked.Read when reading the position
adamsitnik
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Commits on Aug 6, 2021

alternative solution: update _filePosition always AFTER the async operation finishes, but track the next async operation offset in a separate field and update it accordingly
adamsitnik
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don't run the new tests for .NET 5 FileStream
adamsitnik
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