Remove thread-unsafe and unused late_added_files. #49683
Merged
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_reimport_file is called from multiple threads as part of the threaded importer.
Inserting to this set from a thread could hit a race condition leading to memory corruption or hangs.
It seems to be unused, intentionally or unintentionally
Addresses one of the causes of #49324 (comment)
See also here: #47343 (comment)
The unused set that caused the crash was added in bd282ff
CC @reduz