[#1906] Collect CockroachDB special cases in one method

It makes it easier to remove the hack once the issue in Hibernate ORM is solved: https://hibernate.atlassian.net/browse/HHH-19717

Author: DavideD

hibernate-reactive-core/src/main/java/org/hibernate/reactive/generator/values/internal/ReactiveGeneratedValuesHelper.java

@@ -79,8 +79,7 @@ public static GeneratedValuesMutationDelegate getGeneratedValuesDelegate(EntityP
 .anyMatch( part -> part instanceof SelectableMapping selectable
 && selectable.isFormula() );
 
-// Cockroach supports insert returning it but the CockroachDb#supportsInsertReturningRowId() wrongly returns false ( https://hibernate.atlassian.net/browse/HHH-19717 )
-boolean supportsInsertReturningRowId = dialect.supportsInsertReturningRowId() || dialect instanceof CockroachDialect;
+boolean supportsInsertReturningRowId = trueIfCockroach( dialect, dialect.supportsInsertReturningRowId() );
 if ( hasRowId
 && supportsInsertReturning( dialect )
 && supportsInsertReturningRowId
@@ -107,27 +106,29 @@ else if ( timing == EventType.INSERT && persister.getNaturalIdentifierProperties
 return null;
 }
 
+/**
+ * Cockroach supports returning SQL for insert and update statements, but the dialect wrongly returns false.
+ * @see <a href="https://hibernate.atlassian.net/browse/HHH-19717">HHH-19717</a>
+ */
+private static boolean trueIfCockroach(Dialect dialect, boolean predicate) {
+return predicate || dialect instanceof CockroachDialect;
+}
+
 public static boolean supportReactiveGetGeneratedKey(Dialect dialect, List<? extends ModelPart> generatedProperties) {
 return dialect instanceof OracleDialect
 || (dialect instanceof MySQLDialect && generatedProperties.size() == 1 && !(dialect instanceof MariaDBDialect));
 }
 
 public static boolean supportsReturning(Dialect dialect, EventType timing) {
-if ( dialect instanceof CockroachDialect ) {
-// Cockroach supports insert and update returning but the CockroachDb#supportsInsertReturning() wrongly returns false ( https://hibernate.atlassian.net/browse/HHH-19717 )
-return true;
-}
-return timing == EventType.INSERT
-? dialect.supportsInsertReturning()
-: dialect.supportsUpdateReturning();
+return trueIfCockroach(
+dialect, timing == EventType.INSERT
+? dialect.supportsInsertReturning()
+: dialect.supportsUpdateReturning()
+);
 }
 
 public static boolean supportsInsertReturning(Dialect dialect) {
-if ( dialect instanceof CockroachDialect ) {
-// Cockroach supports insert returning but the CockroachDb#supportsInsertReturning() wrongly returns false ( https://hibernate.atlassian.net/browse/HHH-19717 )
-return true;
-}
-return dialect.supportsInsertReturning();
+return trueIfCockroach( dialect, dialect.supportsInsertReturning() );
 }
 
 /**