Remove ulinkAvailable test for RedisLockRegistry

The logic of the test does not reflect the state of the
`RedisLockRegistry` around `ulinkAvailable` property:
we don't check the Redis version anymore, but try to call
`UNLINK` command.
Then we reset `ulinkAvailable` to `false` to call regular `DEL`
for the rest of `RedisLockRegistry` life

The `RedisAvailableRule` marks `testUlink()` as passed even without
calling it.
We are not going to look into fixing the rule since we are migrating
to Testcontainers: #3840

spring-integration-redis/src/test/java/org/springframework/integration/redis/util/RedisLockRegistryTests.java

@@ -18,14 +18,10 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.BDDMockito.willReturn;
-import static org.mockito.Mockito.mock;
 
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
-import java.util.Properties;
 import java.util.Queue;
 import java.util.UUID;
 import java.util.concurrent.Callable;
@@ -53,8 +49,6 @@
 import org.junit.runners.Parameterized.Parameters;
 
 import org.springframework.data.redis.connection.RedisConnectionFactory;
-import org.springframework.data.redis.core.RedisCallback;
-import org.springframework.data.redis.core.RedisOperations;
 import org.springframework.data.redis.core.StringRedisTemplate;
 import org.springframework.integration.redis.rules.RedisAvailable;
 import org.springframework.integration.redis.rules.RedisAvailableTests;
@@ -797,23 +791,6 @@ public void earlyWakeUpTest() throws InterruptedException {
 		executorService.shutdown();
 	}
 
-
-	@SuppressWarnings({ "unchecked", "rawtypes" })
-	@Test
-	public void testUlink() {
-		RedisOperations ops = mock(RedisOperations.class);
-		Properties props = new Properties();
-		willReturn(props).given(ops).execute(any(RedisCallback.class));
-		props.setProperty("redis_version", "3.0.0");
-		RedisLockRegistry registry = new RedisLockRegistry(mock(RedisConnectionFactory.class), "foo");
-		registry.setRedisLockType(testRedisLockType);
-		assertThat(TestUtils.getPropertyValue(registry, "ulinkAvailable", Boolean.class)).isFalse();
-		props.setProperty("redis_version", "4.0.0");
-		registry = new RedisLockRegistry(mock(RedisConnectionFactory.class), "foo");
-		registry.setRedisLockType(testRedisLockType);
-		assertThat(TestUtils.getPropertyValue(registry, "ulinkAvailable", Boolean.class)).isTrue();
-	}
-
 	private Long getExpire(RedisLockRegistry registry, String lockKey) {
 		StringRedisTemplate template = createTemplate();
 		String registryKey = TestUtils.getPropertyValue(registry, "registryKey", String.class);