1. 1. Summary
      Reduce resmoke job count for `replica_sets_reconfig_terminate_primary_jscore_passthrough_priority_ports` on the `rhel8-debug-aubsan-all-feature-flags` variant to relieve memory-pressure task timeouts (BF-44753).

1. 1. Details
      The task repeatedly hit `task-timed-out` under sustained >90% memory. The job count is computed in `buildscripts/evergreen_resmoke_job_count.py` as `round(CPU_COUNT × factor × distro_multiplier)`. On `rhel8.8-large` the distro multiplier is *1.618*, which — combined with rounding — kept `--jobs` pinned at 7 even after lowering the variant-level `resmoke_jobs_factor`.

This adds a per-task override (factor `0.20`) to `_AUBSAN_TASK_FACTOR_OVERRIDES`, dropping the task to ~5-6 jobs and easing memory pressure. Scoped to this task; other tasks on the variant are unaffected.

1. 1. Testing
      Verified via Evergreen patch — the previously-timing-out task now passes (link in comments).