Add BCApps 7070 subscription customer dataset task

[alexei-dobriansky]

Stack

1. BCApps 7070 customer change (this PR)
2. Add BCApps 10345 service contract dataset task #901 — BCApps 10345 service-contract invoicing
3. Add BCApps 10808 exchange rate dataset task #902 — BCApps 10808 exchange-rate adjustment
4. Add BCApps 11274 drop shipment dataset task #903 — BCApps 11274 drop-shipment reversal and version bump

Summary

• add microsoft__BCApps-7070
• align the problem statement with the original GitHub issue
• include shared pinned BC 29/30 artifact configuration and artifact regression tests

Validation

• artifact and dataset integrity tests pass
• previously passed end-to-end in run 35894324791

[Copilot]

Copilot review overview

🟢 Approval recommended

The entry matches the upstream change and its dedicated build-and-test validation job passed.

Review effort: Balanced
Findings: None

What changed in this PR

Adds a validated BCApps Subscription Billing bug-fix task for changing customers on contracts with closed subscription lines.

Changes:

• Adds a text-only reproduction and expected behavior.
• Registers the upstream patch, regression test, and BC 29 setup metadata.
• References an end-to-end validation run that completed successfully.

File	Description
dataset/​problemstatement/​microsoft__BCApps-7070/​README.md	Defines the customer-change reproduction scenario.
dataset/​bcbench.jsonl	Registers the BCApps 7070 benchmark entry.

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[Sun Haoran (haoranpb)]

This is a good addition!

Let's align the problem statement to the original state

[Sun Haoran (haoranpb)]

I think the rebase went wrong..?

I see this commit is rebased away: 8fe7224 , which is fine, I can make a change after your PRs are meged.

[Sun Haoran (haoranpb)]

The rebase went wrong?

[Sun Haoran (haoranpb)]

Oops, my PR went in first, this is now changed to a json file