[DNM] kv: use write batch for small Raft snapshots #63013
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This was the original intention with the
SnapshotRequest_Strategy
structure and was prototyped in #25134, but we never pushed it over
the finish line because we did not find cases where SST ingestion
was disruptive enough to warrant the extra complexity. #62700 tells
a different story.
The size threshold above which we still use SST ingestion is currently
set to 4MB, based on nothing.