improve: replace current formatting plugins with spotless plugin (#2302)

Signed-off-by: Attila Mészáros <[email protected]>

Author: csviri

sample-operators/leader-election/src/test/java/io/javaoperatorsdk/operator/sample/LeaderElectionE2E.java

@@ -10,6 +10,7 @@
 import java.util.OptionalInt;
 import java.util.UUID;
 import java.util.stream.IntStream;
+import javaoperatorsdk.sample.v1.LeaderElection;
 
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;