Note

Add high/low priority pending jobs metrics to the workers threadpool and expose them via INFO MODULES, with supporting APIs and tests.

• Backend / Threadpool:
  • Add redisearch_thpool_high_priority_pending_jobs and redisearch_thpool_low_priority_pending_jobs to fetch queue lengths.
  • Include pending jobs in redisearch_thpool_get_stats (lock-safe access).
• Workers API:
  • Expose workersThreadPool_LowPriorityPendingJobsCount and workersThreadPool_HighPriorityPendingJobsCount.
• Global Stats & INFO output:
  • Extend MultiThreadingStats with workers_low_priority_pending_jobs and workers_high_priority_pending_jobs.
  • Report new fields in INFO MODULES under multi_threading.
• Tests:
  • Add tests validating initial and active worker thread metrics and new pending jobs metrics for FT.SEARCH/FT.AGGREGATE.
  • Introduce helpers: wait_for_condition, launch_cmds_in_bg_with_exception_check, and make load_vectors_to_redis field/dim aware (DEFAULT_VECTOR_FIELD_NAME).

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