[8.2](backport #31268) Detect new files under known paths in filestream input #31278
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## What does this PR do? This PR fixes the `FileWatcher` of `filestream` input. Now a file is considered new even if the scanner has already found it in the previous iteration and the underlying file is different. In the PR the file comparator function is passed as a parameter to make unit testing easier. ## Why is it important? The problem is if an input file is renamed and a new file shows up, Filebeat did not register is as a new file. The new file was either considered updated. Or if the new file was smaller than the previous file, the file was deemed truncated and the complete contents of the previous file was reread from the beginning. (cherry picked from commit 54997ac)
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This is an automatic backport of pull request #31268 done by Mergify.
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