stanza: respect context in emittest.Sink #32733
Merged
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Description:
Respect context cancellation in emittest.Sink to prevent deadlock if the emit callback is invoked during manager shutdown.
Link to tracking Issue:
Related to #32391. Increasing the poll interval in TestCopyTruncate to 5s reliably causes the "timeout: expected: 2700, actual: ..." failure in the linked issue; the test never terminates, and this blocks other tests from running.
Testing:
N/A, fixing test code
Documentation:
N/A