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The implementation of MDEV-24626 was not entirely correct.
We could occasionally fail to remove some *.ibd files on recovery.

deferred_spaces: Keep track of FILE_DELETE records.

deferred_spaces.add(): Do not allow duplicate file names.

recv_rename_files(): Preserve some of renamed_spaces entries for
deferred_spaces.reinit_all().

Thanks to Thirunarayanan Balathandayuthapani for noticing that
deferred_spaces.add() must filter out duplicate file names,
as well as some debugging help.