Only test test_mysql_user with a debug of all variables

I run that on my Workstation and want to compare variables between GHA
and my machine.

.github/workflows/ansible-test-plugins.yml

@@ -116,6 +116,7 @@ jobs:
             sed -i 's/^python_packages:.*/python_packages: [${{ matrix.connector }}]/' ${{ env.connector_version_file }}
           target-python-version: ${{ matrix.python }}
           testing-type: integration
+          target: test_mysql_user
 
   # units:
   #   runs-on: ubuntu-latest

tests/integration/targets/test_mysql_user/tasks/main.yml

@@ -51,6 +51,8 @@
 
     - include: assert_no_user.yml user_name={{user_name_1}}
 
+    - debug: var=hostvars[inventory_hostname]
+
     # ============================================================
     # Create mysql user that already exist on mysql database
     #