resourcecontrol: settle batched cop tasks' execution details

[0xPoe]

What problem does this PR solve?

MakeResponseInfo reads only the top-level execution details of a coprocessor response. A batched request (StoreBatchTasks, used by TiDB's store batching) answers several tasks in one response, and each batch response carries its own task's scan detail and process time. Those nested details are invisible to resource control settlement, so resource groups and RU-based runaway detection undercount the read bytes and KV CPU of every batched cop task.

What is changed and how does it work?

• Sum every batch response's execution details into the ResponseInfo: read bytes from each batch response's scan detail (falling back to its data size when it carries no scan detail), and KV CPU from its time detail.
• Extract the NextGen/legacy read-bytes selection into scanDetailReadBytes and reuse it for the top-level and the batch responses' details.

The accounting is shape-agnostic: it settles batch responses that carry data as well as ones that carry only execution details.

Note for reviewers: this corrects accounted RU upward for workloads using store batching, to the value unbatched execution of the same tasks would settle. If that increase needs gating (a config switch, or NextGen-only like the TotalVersionsSize precedent), I am happy to add it.

Tests

• New unit test TestResponseInfoBatchedTasks covering batch responses with data+details, details only, and data only.

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