1. 1. Description

`CheckMultikeyConsistencyInBackground` failed in BF-46711 (`disagg_concurrency_replication_high_yielding`): the workload under test intentionally drops and re-creates its pool collections, and one such drop raced the hook's doc-sampling read.

In `assertWildcardMultikeyConsistent` (`jstests/hooks/run_check_multikey_consistency.js:144`), the `findOne({}, {_id: 0})` used to sample a document only tolerated `NamespaceNotFound`. A drop that lands *while the read is running* kills the plan executor, so the server returns `QueryPlanKilled` (code 175) instead. That error was re-thrown, the hook exited, and resmoke promoted it to a `ServerFailure` (`check_multikey_consistency_background.py:125`).

This change skips the collection on `QueryPlanKilled` as well, consistent with how the rest of the hook already treats transient drop races (`readCatalogIndexesAtClusterTime` / `readWildcardMultikeyPaths` return `undefined` on any error and the caller skips). This is a test-only fix; server behavior is correct.

Related: BF-46711. Hook introduced in SERVER-128070.