Extend nightly benchmarks to include "index-time KNN filtering"

[kaivalnp]

Spinoff from #468 -- where we added an option to KnnGraphTester to perform "index-time KNN filtering", which simply means creating a new vector field for filters known at index time, and searching through the smaller HNSW graph at query time.

Today, this just duplicates raw vectors in the Lucene index, but we hope to improve that behavior in apache/lucene#14758

Opening this issue to extend nightly benchmarks to regularly test this option, so we can compare it against other ones (like query-time pre and post filter)