TaskTree: Rename setupRoot into setRecipe

The passed Group root element is a recipe with
a full description on how to execute the tasks
and how to handle finished tasks.

We have already virtual methods / setters called like:
deployRecipe, refreshRecipe, reloadRecipe. So, the
common "recipe" is kind of consistent.

Fix typos in warnings.

Addresses the 11th point in the task below.

Task-number: QTCREATORBUG-28741
Change-Id: I1c80f4838b6a3e5ed113eaf8e42b59746d098efe
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/debugger/loadcoredialog.cpp

@@ -257,7 +257,7 @@ void AttachCoreDialog::accepted()
                           [=](const auto &task) { d->symbolFileResult = task.result(); }},
     };
 
-    d->taskTree.setupRoot(root);
+    d->taskTree.setRecipe(root);
     d->taskTree.start();
 
     d->progressLabel->setText(Tr::tr("Copying files to device..."));