xfs: log EFIs for all btree blocks being used to stage a btree

We need to log EFIs for every extent that we allocate for the purpose of
staging a new btree so that if we fail then the blocks will be freed
during log recovery.  Use the autoreaping mechanism provided by the
previous patch to attach paused freeing work to the scrub transaction.
We can then mark the EFIs stale if we decide to commit the new btree, or
we can unpause the EFIs if we decide to abort the repair.

Signed-off-by: Darrick J. Wong <[email protected]>
Reviewed-by: Dave Chinner <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>

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