Ensure exit_json returns failed = False

This is required for modules that may return a non-zero `rc` value for a
successful run, similar to #24865 for Windows fixing **win_chocolatey**.

We also disable the dependency on `rc` value only, even if `failed` was
set.

Adapted unit and integration tests to the new scheme.
Updated raw, shell, script, expect to take `rc` into account.

lib/ansible/plugins/action/script.py

@@ -93,4 +93,8 @@ class ActionModule(ActionBase):
 
         result['changed'] = True
 
+        if 'rc' in result and result['rc'] != 0:
+            result['failed'] = True
+            result['msg'] = 'non-zero return code'
+
         return result