8316193: jdk/jfr/event/oldobject/TestListenerLeak.java java.lang.Exception: Could not find leak

[cost0much]

Clean backport that makes TestListenerLeak more robust; already backported to 17 and 21. Passes affected test on Linux x64. MacOS GHA failing due to unrelated deprecated code during compile.

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Progress

• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue
• [ ] JDK-8316193 needs maintainer approval

Issue

• JDK-8316193: jdk/jfr/event/oldobject/TestListenerLeak.java java.lang.Exception: Could not find leak (Bug - P4 - Requested)

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