fix: remove Thread.sleep() from DefaultWorkQueueTest

[sarveshkaushal]

Notes

This change removes the Thread.sleep() dependency on the DefaultWorkQueueTest and replaces it with explicit thread synchronization.. This is related to issue #1223

Testing

Ran mvn install from project root and build completed successfully.

[kubernetes-prow]

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[sarveshkaushal]

/assign @brendandburns
/assign @yue9944882

[brendandburns]

I think there are a lot of whitespace changes that make this hard to review because it makes the diff much bigger than it needs to be.

Please minimize the diff and then I can do a real review.

[sarveshkaushal]

@brendandburns - Thanks for pointing that out. I ran IntelliJ's code formatter on the file, so the formatting in the changed section is formatter-generated rather than intentional whitespace changes. I checked the Git diff as well, and there don't appear to be whitespace-only changes outside the modified test.