fix Windows tests with hardcoded Administrator account (#35339)

* Admin account is not always called Administrator (eg Azure)
* this fixes some, but not all issues related to the Administrator account on non-English Windows as well (still numerous references to "Administrators" and other en-US Windows group names)

test/integration/targets/win_scheduled_task_stat/tasks/main.yml

@@ -1,4 +1,12 @@
 ---
+- name: Look up built-in Administrator account name (-500 user whose domain == computer name)
+  raw: $machine_sid = (Get-CimInstance Win32_UserAccount -Filter "Domain='$env:COMPUTERNAME'")[0].SID -replace '(S-1-5-21-\d+-\d+-\d+)-\d+', '$1'; (Get-CimInstance Win32_UserAccount -Filter "SID='$machine_sid-500'").Name
+  check_mode: no
+  register: admin_account_result
+
+- set_fact:
+    admin_account_name: "{{ admin_account_result.stdout_lines[0] }}"
+
 - name: ensure task is deleted before test
   win_scheduled_task:
     name: '{{test_scheduled_task_stat_name}}'
@@ -34,7 +42,7 @@
     name: '{{test_scheduled_task_stat_name}}'
     state: present
     logon_type: interactive_token
-    username: Administrator
+    username: '{{ admin_account_name }}'
     author: Ansible Author
     description: Fake description
     execution_time_limit: PT23H
@@ -102,7 +110,7 @@
     - stat_task_present.principal.group_id == None
     - stat_task_present.principal.logon_type == "TASK_LOGON_INTERACTIVE_TOKEN"
     - stat_task_present.principal.run_level == "TASK_RUNLEVEL_LUA"
-    - stat_task_present.principal.user_id.endswith("Administrator")
+    - stat_task_present.principal.user_id.endswith(admin_account_name)
     - stat_task_present.registration_info.author == "Ansible Author"
     - stat_task_present.registration_info.date is defined
     - stat_task_present.registration_info.description == "Fake description"