[8.7] Return a copy of messages in MockMTAppender (#94982) #95004
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Couldn't reproduce the failure, but in principle there is an issue there. Other options are a CopyOnWriteArrayList or just synchronizing on `messages()` return value. Returning a copy should be enough, since this is only used in one place for asserting some test expectations in an `assertBusy`. Closes elastic#94559
pxsalehi
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Cherry-pick of #94982