Fix a corner case where createDirectory would fail on windows #1618
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The //?/ prefix needs to be added to directories if the length is greater than MAX_PATH - 12, however the PATHCCH_ALLOW_LONG_PATHS to PathAllocCanonicalize would only do that if the path was greater than MAX_PATH. This change uses PATHCCH_ENSURE_IS_EXTENDED_LENGTH_PATH, which forces it on all the time. Just needed to remove the prefix in a few places as it was making it way out into tests as this is suppose to be transparent to the user. This also fixes createDirectory() "withIntermediateDirectories: true" for long paths on Windows. (cherry picked from commit 6b787ac)
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The //?/ prefix needs to be added to directories if the length is greater than MAX_PATH - 12, however the PATHCCH_ALLOW_LONG_PATHS to PathAllocCanonicalize would only do that if the path was greater than MAX_PATH. This change uses PATHCCH_ENSURE_IS_EXTENDED_LENGTH_PATH, which forces it on all the time. Just needed to remove the prefix in a few places as it was making it way out into tests as this is suppose to be transparent to the user.
This also fixes createDirectory() "withIntermediateDirectories: true" for long paths on Windows.