KAFKA-12819: Add assert messages to MirrorMaker tests plus other qual… #10762
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This PR does various QoL improvements for the MM tests, mainly some basic refactoring to remove some boilerplate as well as adding messages to all of the assert statements so that if they fail there is more context
Some improvements to the assert failure messages may need to be done to make it more clear whats actually going on, @ryannedolan you may have more to add on this point.