Fix race in AsyncPollerTest.testSuspendPolling #2452

Job	Run time
Javadoc	3m 0s
Code format	58s
Unit test with cloud	4m 31s
Unit test with in-memory test service [Edge]	11m 19s
Unit test with docker service [JDK8]	13m 49s
Build native test server / Build native test server (windows-latest, windows, amd64)	5m 43s
Build native test server / Build native test server (ubuntu-latest, linux, amd64, true)	6m 28s
Build native test server / Build native test server (macos-latest, macOS, arm64)	13m 47s
Build native test server / Build native test server (ubuntu-latest, linux, amd64, false)	7m 10s
Build native test server / Build native test server (ubuntu-24.04-arm, linux, arm64)	6m 43s
Build native test server / Build native test server (macos-15-intel, macOS, amd64)	10m 56s
	1h 24m 24s

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