[To dev/1.3] [Pipe] Preserve downstream sink error messages (#18553)

[Caideyipi]

Description

Backport #18553 to dev/1.3.

Changes

• Recursively select a concrete downstream receiver error from nested TSStatus responses instead of exposing only an aggregate wrapper.
• Preserve the latest root-cause text in asynchronous retry summaries.
• Clear stale retry failure text when retry queues drain, events are discarded, or the sink closes.
• Add regression coverage for status propagation, retry-message formatting, and TsFile cleanup.

Adaptation

The implementation is adapted to the dev/1.3 tree-model APIs. This branch does not contain the master i18n message bundle, so the new retry templates are kept as local constants.

Verification

Not run, per request.

Source commit: 18ec5f0a393ed7cee0e3d30df5bf96e034d565d8

---

Key changed/added classes

• PipeReceiverStatusHandler
• IoTDBDataRegionAsyncSink
• Pipe receiver and async sink regression tests