branch-4.1: [Fix](query cache) support partition-based instance parallelism #60974#61438
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### What problem does this PR solve? When total tablets are much larger than pipeline capacity, one-tablet-per-instance planning creates excessive BE concurrency pressure in query-cache workloads. Trigger partition-based planning when: total_tablets > parallel_pipeline_task_num * participating_be_num Before: instance_num ~= total_tablets After: instance_num ~= partitions_on_each_be Per-BE planning example: BE1 tablets: p1[t1,t2], p2[t3] -> instances: [p1:t1,t2], [p2:t3] BE2 tablets: p1[t4], p2[t5,t6] -> instances: [p1:t4], [p2:t5,t6] This keeps tablets from the same partition in one instance and separates different partitions into different instances. If partition mapping is incomplete or partition planning fails, fallback to default planning for correctness. Tests: - partition-based planning path - fallback-to-default path (incomplete mapping) - non-query-cache default planning path
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Cherry-picked from #60974