storage: use a write-only batch for replica data destruction
storage: use a write-only batch for replica data destruction

name                  old time/op    new time/op    delta
ClearRange_RocksDB-8     278ms ± 2%     225ms ± 4%  -19.15%         (p=0.000 n=10+9)

name                  old speed      new speed      delta
ClearRange_RocksDB-8   241MB/s ± 2%   298MB/s ± 4%  +23.72%         (p=0.000 n=10+9)

vaibhavarora/cockroach,paperstreet/cockroach,glycerine/cockroach,vaibhavarora/cockroach,glycerine/cockroach,maxlang/cockroach,maxlang/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,glycerine/cockroach,paperstreet/cockroach,paperstreet/cockroach,paperstreet/cockroach,maxlang/cockroach,glycerine/cockroach,maxlang/cockroach,glycerine/cockroach,glycerine/cockroach,glycerine/cockroach,paperstreet/cockroach,maxlang/cockroach,vaibhavarora/cockroach,maxlang/cockroach,paperstreet/cockroach,paperstreet/cockroach,maxlang/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,glycerine/cockroach,paperstreet/cockroach,maxlang/cockroach