Cherry-pick #8087 to 6.x: Improve error catching for recursiveWatcher #8342
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Cherry-pick of PR #8087 to 6.x branch. Original message:
There have been spurious test failures in test_file_integrity.Test.test_recursive (#7731).
This makes sure all errors encountered in recursiveWatcher are caught and logged, and also adds a debug message when a new recursive watch is added.