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box: fix yielding DDL ordering on WAL failure

Serialize yielding DDL operations on the same space to avoid reordering
of data dictionary updates when the first DDL updated _space/_index
in-memory and then failed to write to WAL.

To do so, add internal before_replace triggers for _space and _index that
wait for completion of previous yielding alters on the same space before
applying the next change.

Closes #11833

NO_DOC=bugfix

(cherry picked from commit 6e5a97c04)

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