fix(perf regression): TopicName parsing per publish #2304
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Fixes #2295
i believe this was introduced in db522b6
With the same reproducer as in the issue. From testing it seems to improve throughput by 10%
Profile before
producer_load_test_v1.zip
Profile after
producer_load_test_after_optimization_v1.zip
Note: I believe there is a similar problem in
OpenTelemetryPubsubTracer.startPublishRpcSpan. But I kept the scope of this PR to a minimum.