RFR: 8308608: [testbug] Use Util::waitForIdle instead of Toolkit::firePulse in system tests [v2]

[Andy Goryachev]

On Wed, 6 Sep 2023 05:58:22 GMT, Karthik P K <kpk at openjdk.org> wrote:

>> Made changes to use Util::waitForIdle instead of Toolkit::firePulse in system tests. The test will wait for default value of 10 pulses to complete in the scene before executing the subsequent statements.
>
> Karthik P K has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review comments

looks good, thanks!

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Marked as reviewed by angorya (Reviewer).

PR Review: https://git.openjdk.org/jfx/pull/1230#pullrequestreview-1613637038