tarantool / tarantool / 14104121916

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wal: use existing logs sizes after restart

During the `checkpoint_wal_threshold` exceedance checks tarantool used
to ignore the sizes of files created prior to the server restart which
resulted in cases when the server didn't create any checkpoints and
generate a huge amount of logs which were replayed each server restart.
Now the `wal_dir` is scanned for proper `writer->checkpoint_wal_size`
calculation after the recovery process.

Fixes #9811
NO_DOC=bugfix

(cherry picked from commit f1ccb2f14)

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