fix: prevent EBICS batch imports from being skipped when camt.054 download is disabled

[Copilot]

When batch splitting is enabled but camt.054 downloads are disabled, unresolved batch entries were treated as transient failures and the main statement import was skipped indefinitely.

• Batch import behavior

  • Keep sub-transaction splitting controlled by Split Batch Transactions.
  • Treat an unresolved batch as transient only when Download Batch Transactions is enabled, so a later camt.054 download can resolve it.
  • When downloads are disabled and sub-transactions are unavailable, import the batch as a single Bank Transaction.

• Regression coverage

  • Verifies split and download settings are passed independently.
  • Covers importing unresolved batches as a single transaction when downloads are disabled.
  • Covers retaining the skip-and-retry path when downloads are enabled.

• Fixes Import skipped forever when split is on but download_batch_transactions is off #421

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

_{Reviews (5): Last reviewed commit: "style: format with ruff" | Re-trigger Greptile}

[barredterra]

@Mergifyio backport version-15-hotfix

[mergify]

backport version-15-hotfix

🟠 Waiting for conditions to match

Details

• merged [📌 backport requirement]