Fix/lwt routing lbp filtering 384#784

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nikagra wants to merge 2 commits intoscylladb:scylla-4.xfrom

nikagra:fix/lwt-routing-lbp-filtering-384

Commits on Jan 15, 2026

fix(#384): refactoring `DefaultLoadBalancingPolicy` to include LWT logic
nikagra
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Commits on Jan 16, 2026

fix(#384): Ignore local racks for LWT statements in `DefaultLoadBalancingPolicy.newQUeryPlan()`.
nikagra
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