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fix: improve http connection pooling for smtp notifications#20605
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This change updates how SMTP notifications are polled during scale tests.
Before, each of the ~2,000 pollers created its own http.Client, which opened thousands of short-lived TCP connections.
Under heavy load, this ran out of available network ports and caused errors like
connect: cannot assign requested addressNow, all pollers share one HTTP connection pool. This prevents port exhaustion and makes polling faster and more stable.
If a network error happens, the poller will now retry instead of stopping, so tests keep running until all notifications are received.
The
SMTPRequestTimeoutis now applied per request using a context, instead of being set on thehttp.Client.