Make parallel platform gen task scheduler the default one

bom-decomposer/src/main/java/io/quarkus/bom/decomposer/BomDecomposer.java

@@ -29,10 +29,6 @@
 
 public class BomDecomposer {
 
-    public static boolean isParallelProcessing() {
-        return Boolean.getBoolean("parallelProcessing");
-    }
-
     public static BomDecomposerConfig config() {
         return new BomDecomposer().new BomDecomposerConfig();
     }

bom-decomposer/src/main/java/io/quarkus/bom/task/ConcurrentTaskScheduler.java → bom-decomposer/src/main/java/io/quarkus/bom/task/ParallelTaskScheduler.java

@@ -6,7 +6,7 @@
 import java.util.concurrent.ConcurrentLinkedDeque;
 import java.util.concurrent.Phaser;
 
-public class ConcurrentTaskScheduler implements PlatformGenTaskScheduler {
+public class ParallelTaskScheduler implements PlatformGenTaskScheduler {
 
     private final Phaser phaser = new Phaser(1);
     private final Deque<Exception> errors = new ConcurrentLinkedDeque<>();

bom-decomposer/src/main/java/io/quarkus/bom/task/PlatformGenTaskScheduler.java

@@ -1,12 +1,13 @@
 package io.quarkus.bom.task;
 
-import io.quarkus.bom.decomposer.BomDecomposer;
 import java.util.Collection;
 
 public interface PlatformGenTaskScheduler {
 
+    boolean IS_PARALLEL_DEFAULT = !Boolean.getBoolean("sequentialTaskScheduler");
+
     static PlatformGenTaskScheduler getInstance() {
-        return BomDecomposer.isParallelProcessing() ? new ConcurrentTaskScheduler() : new SequentialTaskScheduler();
+        return IS_PARALLEL_DEFAULT ? new ParallelTaskScheduler() : new SequentialTaskScheduler();
     }
 
     void schedule(PlatformGenTask task) throws Exception;