release-19.2: storage: Use batches for direct RocksDB mutations #55747
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19.2 backport of #55708 .
Currently, doing direct mutations on a RocksDB instance bypasses
custom batching / syncing logic that we've built on top of it.
This, or something internal to RocksDB, started leading to some bugs
when all direct mutations started passing in WriteOptions.sync = true
(see #55240 for when this change went in).
In this change, direct mutations still commit the batch with sync=true
to guarantee WAL syncing, but they go through the batch commit pipeline
too, just like the vast majority of operations already do.
Fixes #55362.
Release note: None.