kv: finish up impl of TargetBytes scan limit #45319
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This PR finishes up the work initiated in #44925 to allow (forward and
reverse) scans to specify a TargetBytes hint which (mod overshooting by
one row) restricts the size of the responses.
The plan is to use it in kvfetcher, however this is left as a separate
commit - here we focus on testing the functionality only.
Release note: None