win_regedit: fix extra info coming into stdout (#31813)

lib/ansible/modules/windows/win_regedit.ps1

@@ -243,7 +243,7 @@ if ($state -eq "present") {
     if (-not (Test-Path -path $path)) {
         # the key doesn't exist, create it so the next steps work
         try {
-            New-Item -Path $path -Type directory -Force -WhatIf:$check_mode
+            $null = New-Item -Path $path -Type directory -Force -WhatIf:$check_mode
         } catch {
             Fail-Json $result "failed to create registry key at $($path): $($_.Exception.Message)"
         }
@@ -330,7 +330,7 @@ $key_prefix[$path]
         if ($delete_key -and $name -eq $null) {
             # the clear_key flag is set and name is null so delete the entire key
             try {
-                Remove-Item -Path $path -Force -Recurse -WhatIf:$check_mode
+                $null = Remove-Item -Path $path -Force -Recurse -WhatIf:$check_mode
             } catch {
                 Fail-Json $result "failed to delete registry key at $($path): $($_.Exception.Message)"
             }

test/integration/targets/win_regedit/tasks/tests.yml

@@ -421,3 +421,40 @@
   assert:
     that:
     - not create_hkcr_key_again|changed
+
+# https://github.com/ansible/ansible/issues/31782
+- name: create property like a json string
+  win_regedit:
+    path: '{{test_win_regedit_local_key}}\NewKey'
+    name: '{7f51bda7-bcea-465a-9eb6-5a2bcd9cb52f}'
+    data: test data
+    type: string
+    state: present
+  register: create_prop_with_json
+
+- name: get result of create property like a json string
+  win_reg_stat:
+    path: '{{test_win_regedit_local_key}}\NewKey'
+    name: '{7f51bda7-bcea-465a-9eb6-5a2bcd9cb52f}'
+  register: create_prop_with_json_result
+
+- name: assert results of create property like a json string
+  assert:
+    that:
+    - create_prop_with_json|changed
+    - create_prop_with_json_result.exists == True
+    - create_prop_with_json_result.value == 'test data'
+
+- name: create property like a json string (idempotent)
+  win_regedit:
+    path: '{{test_win_regedit_local_key}}\NewKey'
+    name: '{7f51bda7-bcea-465a-9eb6-5a2bcd9cb52f}'
+    data: test data
+    type: string
+    state: present
+  register: create_prop_with_json_again
+
+- name: assert results of create property like a json string (idempotent)
+  assert:
+    that:
+    - not create_prop_with_json_again|changed