[stable-2.18] - script fix become on Windows (#85077) (#85078)

Fixes become when using script on Windows and the become options were
set through host vars or sources that was not set on the task directives
itself.

(cherry picked from commit 59e2ddcae0)

changelogs/fragments/win-script-become.yml

@@ -0,0 +1,4 @@
+bugfixes:
+  - >-
+    script - Fix up become support for Windows scripts when become was set through host variables and not on the task
+    directly - https://github.com/ansible/ansible/issues/85076

lib/ansible/plugins/action/script.py

@@ -150,11 +150,23 @@ class ActionModule(ActionBase):
             # like become and environment args
             if getattr(self._connection._shell, "_IS_WINDOWS", False):
                 # FUTURE: use a more public method to get the exec payload
-                pc = self._task
+                become = False
+                become_method = None
+                become_user = None
+                become_pass = None
+                become_flags = None
+                if self._connection.become:
+                    become_plugin = self._connection.become
+                    become = True
+                    become_method = become_plugin.name
+                    become_user = become_plugin.get_option('become_user', playcontext=self._play_context)
+                    become_pass = become_plugin.get_option('become_pass', playcontext=self._play_context)
+                    become_flags = become_plugin.get_option('become_flags', playcontext=self._play_context)
+
                 exec_data = ps_manifest._create_powershell_wrapper(
                     to_bytes(script_cmd), source, {}, env_dict, self._task.async_val,
-                    pc.become, pc.become_method, pc.become_user,
-                    self._play_context.become_pass, pc.become_flags, "script", task_vars, None
+                    become, become_method, become_user,
+                    become_pass, become_flags, "script", task_vars, None
                 )
                 # build the necessary exec wrapper command
                 # FUTURE: this still doesn't let script work on Windows with non-pipelined connections or

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

@@ -314,3 +314,17 @@
     that:
     - test_script_result_become.stdout_lines[0]|lower == 'nt authority\\system'
     - test_script_result_become.stdout_lines[1] == 'finished'
+
+- name: run test script with become set by vars
+  script: test_script_whoami.ps1
+  register: test_script_result_become_vars
+  vars:
+    ansible_become: yes
+    ansible_become_user: SYSTEM
+    ansible_become_method: runas
+
+- name: check that the script ran and we get both outputs on new lines
+  assert:
+    that:
+    - test_script_result_become_vars.stdout_lines[0]|lower == 'nt authority\\system'
+    - test_script_result_become_vars.stdout_lines[1] == 'finished'