TECH-421: Allow queueing of migrations to run during cron

Create queueworkers to run during cron Update batch import form with new button

src/Form/BatchImportForm.php

@@ -100,10 +100,17 @@ class BatchImportForm extends ConfigFormBase {
     $form['#attached']['library'][] = 'batch_import/import_form';
 
     $form['actions']['#type'] = 'actions';
+    $form['actions']['queue_import'] = [
+      '#type' => 'submit',
+      '#value' => $this->t('Queue import for cron'),
+      '#button_type' => 'primary',
+      '#submit' => [[$this, 'queueSubmitForm']],
+    ];
     $form['actions']['run_import'] = [
       '#type' => 'submit',
-      '#value' => $this->t('Trigger Batch Import'),
+      '#value' => $this->t('Manually run import'),
       '#button_type' => 'primary',
+      '#submit' => [[$this, 'manualSubmitForm']],
     ];
 
     return parent::buildForm($form, $form_state);
@@ -207,7 +214,22 @@ class BatchImportForm extends ConfigFormBase {
   /**
    * {@inheritdoc}
    */
-  public function submitForm(array &$form, FormStateInterface $form_state) {
+  public function manualSubmitForm(array &$form, FormStateInterface $form_state) {
+    // Loop through selected migrations.
+    $plugins = $form_state->getValue('migrations');
+    // Filter out empty values.
+    $plugins = array_filter($plugins);
+
+    // Run migrations.
+    $this->migrationActivation->manualMigration($plugins);
+
+    parent::submitForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function queueSubmitForm(array &$form, FormStateInterface $form_state) {
     // Loop through selected migrations.
     $plugins = $form_state->getValue('migrations');
     // Filter out empty values.