RFR: 8296919: Make system tests that detect memory leaks more robust by using JMemoryBuddy utility [v4]

[Lukasz Kostyra]

On Thu, 4 May 2023 08:21:15 GMT, Lukasz Kostyra <lkostyra at openjdk.org> wrote:

>> Verified these changes on all platforms and saw no abnormalities in test execution.
>> 
>> This change is based on a preliminary patch done by @aghaisas , with some minor changes and the addition of one Leak-related web test. EventListenerLeak test was not touched, as it is a separate manual test app instead of a JUnit test.
>
> Lukasz Kostyra has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update javafx.web classpath to include JMemoryBuddy

I removed the sleeps, ran the test multiple times on all platforms and didn't notice any abnormalities.

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PR Comment: https://git.openjdk.org/jfx/pull/1121#issuecomment-1536056184