ESQL: Fix DateDiffTests suite timeout (#138657)

Fixes #138617

The amount of cases on DateDiffTests (Similar to DateTruncTests) sometimes lead to a timeout. The suite takes around 10 minutes in (my) local tests, 20.000 tests, which will sometimes surpass the 20 min limit in CI

Author: ivancea

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/scalar/date/DateDiffTests.java

@@ -9,7 +9,9 @@
 
 import com.carrotsearch.randomizedtesting.annotations.Name;
 import com.carrotsearch.randomizedtesting.annotations.ParametersFactory;
+import com.carrotsearch.randomizedtesting.annotations.TimeoutSuite;
 
+import org.apache.lucene.tests.util.TimeUnits;
 import org.apache.lucene.util.BytesRef;
 import org.elasticsearch.common.time.DateUtils;
 import org.elasticsearch.xpack.esql.core.expression.Expression;
@@ -31,6 +33,8 @@
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.startsWith;
 
+// The amount of cases sometimes exceed the 20 minutes
+@TimeoutSuite(millis = 60 * TimeUnits.MINUTE)
 public class DateDiffTests extends AbstractConfigurationFunctionTestCase {
     public DateDiffTests(@Name("TestCase") Supplier<TestCaseSupplier.TestCase> testCaseSupplier) {
         this.testCase = testCaseSupplier.get();