Do not wrap non build exceptions

Author: gnodet

maven-api-impl/src/main/java/org/apache/maven/internal/impl/model/DefaultModelBuilder.java

@@ -73,6 +73,7 @@
 import org.apache.maven.api.model.Repository;
 import org.apache.maven.api.services.BuilderProblem;
 import org.apache.maven.api.services.BuilderProblem.Severity;
+import org.apache.maven.api.services.MavenException;
 import org.apache.maven.api.services.ModelBuilder;
 import org.apache.maven.api.services.ModelBuilderException;
 import org.apache.maven.api.services.ModelBuilderRequest;
@@ -739,6 +740,7 @@ private void buildBuildPom() throws ModelBuilderException {
             // For the top model and all its children, build the effective model.
             // This is done through the phased executor
             var allResults = results(result).toList();
+            MavenException fatalException = new MavenException();
             try (PhasingExecutor executor = createExecutor()) {
                 for (DefaultModelBuilderResult r : allResults) {
                     executor.execute(() -> {
@@ -748,13 +750,16 @@ private void buildBuildPom() throws ModelBuilderException {
                         } catch (ModelBuilderException e) {
                             // gathered with problem collector
                         } catch (Exception t) {
-                            mbs.add(Severity.FATAL, ModelProblem.Version.BASE, t.getMessage(), t);
+                            fatalException.addSuppressed(t);
                         }
                     });
                 }
             }
 
             // Check for errors again after execution
+            if (fatalException.getSuppressed().length > 0) {
+                throw fatalException;
+            }
             if (hasErrors()) {
                 throw newModelBuilderException();
             }