KAFKA-19676 EpochState should override close to avoid throwing IOException (apache#20508)

Jira: [KAFKA-19676](https://issues.apache.org/jira/browse/KAFKA-19676)
All subclasses of EpochState do not throw an IOException when closing,
so catching it is unnecessary. We could override close to remove the
IOException declaration.

Reviewers: Jhen-Yung Hsu <[email protected]>, TaiJuWu
 <[email protected]>, Chia-Ping Tsai <[email protected]>

Author: JimmyWang6

raft/src/main/java/org/apache/kafka/raft/EpochState.java

@@ -59,4 +59,11 @@ default Optional<LogOffsetMetadata> highWatermark() {
      * User-friendly description of the state
      */
     String name();
+
+    /**
+     * Since all subclasses implement the Closeable interface while none throw any IOException,
+     * this implementation is provided to eliminate the need for exception handling in the close operation.
+     */
+    @Override
+    void close();
 }

raft/src/main/java/org/apache/kafka/raft/QuorumState.java

@@ -27,8 +27,6 @@
 
 import org.slf4j.Logger;
 
-import java.io.IOException;
-import java.io.UncheckedIOException;
 import java.util.List;
 import java.util.Optional;
 import java.util.OptionalInt;
@@ -736,12 +734,7 @@ private void durableTransitionTo(EpochState newState) {
 
     private void memoryTransitionTo(EpochState newState) {
         if (state != null) {
-            try {
-                state.close();
-            } catch (IOException e) {
-                throw new UncheckedIOException(
-                    "Failed to transition from " + state.name() + " to " + newState.name(), e);
-            }
+            state.close();
         }
 
         EpochState from = state;