Thread the per-table large_data_guardrail through the write path so
that mutations exceeding configured thresholds are rejected before
being applied to the memtable.
The guardrail is selected in database::do_apply — either the table's
own guardrail or a static noop when skip_large_data_guardrails is set.
It flows through apply_in_memory → table::apply →
memtable::apply, where the check runs after partition_builder
deserializes the frozen mutation. For large mutations (>128KB), the
check runs after unfreeze_gently instead.
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