Improve handling of different path variants on Windows (#3781) #3786
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If forward slashes were used on Windows the glob was not matching on startup which lead to the issue that data was resent. This is solved in 5.3 by using path.Abs for all paths which also includes Clean. To make sure Path and Glob are always clean, Cleanup was added to the MatchFile part. This makes sure in case old data / incorrect data is loaded, the comparison will still work. More tests were added for windows to verify change.
Before this change, option 1 below did not work.
Based on https://discuss.elastic.co/t/duplicate-events-with-filebeat-on-windows-on-service-restart/78743/10
(cherry picked from commit 4527162)