Precompiled 2025-09-17-e184e8b

Refactor vector tests to simplify setup (#41086)

Simplifies test setup for vector tests by adding a helper to create backfill flusher and removing the weird enum option for configuring the scenario. Simplifies to a fresh scenario with no indexes in `Scenario::new` or a scenario with an enabled index in `Scenario::new_with_enabled_index`

GitOrigin-RevId: 3821c25ac48c962307bdfdd126551f7682fb92d1