fix win_shell/win_command nonzero RC failure setting (#26443)

* as a result of recent core engine changes to ignore rc, modules are responsible to set `failed` on nonzero RC if they want that behavior
* the `failed` filter currently triggers on nonzero RC, which caused the tests to false-pass
* updated tests to explicitly check both rc and failed keys, as well as using the failed filter.

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

@@ -120,6 +120,7 @@
   assert:
     that:
     - cmdout|failed
+    - cmdout.failed == True # check the failure key explicitly, since failed does magic with RC
     - cmdout.rc == 254
 
 - name: interleave large writes between stdout/stderr (check for buffer consumption deadlock)