Add missing dummy files for git mode when collecting config

tasks/collect_config/finish/git.yml

+---
+# file: roles/drupal/tasks/config_collect/finish/git.yml
+
+- name: Set facts
+  set_fact:
+    dummy: yes

tasks/collect_config/prepare/git.yml

+---
+# file: roles/drupal/tasks/config_collect/prepare/git.yml
+
+- name: Set facts
+  set_fact:
+    dummy: yes