Make waitWhile() utility method in debug tests static #2388
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The waitWhile() method for waiting until a condition is fulfilled is implemented as an instance method of AbstractDebugTest. The reason is that the test class instance itself is passed as a context to that method. This context, however, is not used by any of the method's consumers.
This change removes the unnecessary context from the waitWhile() method and simplifies all consumers accordingly. With that, the method in AbstractDebugTests degrades to a pure delegation to the same method in TestUtil, which is why the method is removed from the test superclass and consumers are adapted to directly call the method in TestUtil.