Avoid calling Node.getExecutionMode() unnecessarily

Since the implementation may do annotation lookups etc. it should only
be called when the result is going to be used.

Author: marcphilipp

Diff for: junit-platform-engine/src/main/java/org/junit/platform/engine/support/hierarchical/NodeTestTask.java

@@ -76,7 +76,8 @@ public ResourceLock getResourceLock() {
 
 	@Override
 	public ExecutionMode getExecutionMode() {
-		return taskContext.getExecutionAdvisor().getForcedExecutionMode(testDescriptor).orElse(node.getExecutionMode());
+		return taskContext.getExecutionAdvisor().getForcedExecutionMode(testDescriptor) //
+				.orElseGet(node::getExecutionMode);
 	}
 
 	@Override