Benchmark: Remove or fix 'common term' query case

[tjgreen42]

The MS-MARCO benchmark includes a "common term" query that searches for \"the\".

This is a stopword that gets filtered out by the English text search configuration, resulting in an empty query. The benchmark is measuring no-op overhead rather than actual common term performance.

Options:

1. Remove this benchmark case entirely
2. Replace with a genuinely common non-stopword term like "information" or "system"

Low priority cleanup.