fix(v10/node): Stop leaking unhandled rejections on aborted Vercel AI streams - #24563
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Test omits expected abort handling
Medium Severity
The aborted-stream scenario iterates textStream and leaves run uncaught, so the abort itself can reject. Sentry's default unhandled-rejection warn mode then writes to stderr, which makes ensureNoErrorOutput fail even after the instrumentation fix and prevents the test from isolating the extra rejection this PR addresses. The sibling scenario-rejected-model scenario catches the expected failure; this one does not.
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…l payload The orchestrion Vercel AI path leaks unhandled rejections on an aborted stream for the same reason as v11: `end(error)` annotated the span but left the payload looking successful, so `beforeSpanEnd` enriched from the `StreamTextResult` and read its promise-valued getters.
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Backport of #24540