Pass windows command as-is without splitting/rejoining parameters.

* Fixes extra spaces added between parameters from https://github.com/ansible/ansible-modules-core/issues/1929
* Correctly decode PowerShell command encoded as UTF-16-LE so that it displays correctly in debug messages, fixes the other issue from https://github.com/ansible/ansible-modules-core/issues/1929
* Add test to verify that script parameters are passed as-is, so $true is interpreted as a boolean, fixes https://github.com/ansible/ansible/issues/10947

test/integration/roles/test_win_script/files/test_script_bool.ps1

@@ -0,0 +1,6 @@
+Param(
+[bool]$boolvariable
+)
+
+Write-Host $boolvariable.GetType()
+Write-Host $boolvariable

test/integration/roles/test_win_script/tasks/main.yml

@@ -171,3 +171,13 @@
       - "not test_cmd_result.stderr"
       - "not test_cmd_result|failed"
       - "test_cmd_result|changed"
+
+- name: run test script that takes a boolean parameter
+  script: test_script_bool.ps1 $true
+  register: test_script_bool_result
+
+- name: check that the script ran and the parameter was treated as a boolean
+  assert:
+    that:
+      - "test_script_bool_result.stdout_lines[0] == 'System.Boolean'"
+      - "test_script_bool_result.stdout_lines[1] == 'True'"