Remove sleep in tests in replace_failed_process_groups_test.go

[xumengpanda]

What would you like to be added/changed?

The taint related test uses sleep to verify that the feature can replace pods on a timely manner. Using sleep() in unit tests is suboptimal because it can slow down the test speed and can become flaky when running on slower hardware.

Task:

• [ ] We should consider if there is a better way to validate the timing behavior of the taint feature.
• [ ] We should fix this flaky test .