[3.4] [serverWatchStream] terminate recvLoop on sws.close()

[veshij]

backport of #18739 to 3.4

[k8s-ci-robot]

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[ahrtr]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[ivanvc]

/retitle [3.4] [serverWatchStream] terminate recvLoop on sws.close()

[ahrtr]

Link to #18704