[MINOR] Clean up coordinator-common and server modules #19009
+115
−125
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Given that now we support Java 17 on our brokers, this PR replace the use of :
Collections.singletonList() and Collections.emptyList() with List.of()
Collections.singletonMap() and Collections.emptyMap() with Map.of()
Collections.singleton() and Collections.emptySet() with Set.of()
Affected modules: server and coordinator-common