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/module_utils/basic.py

@@ -2023,6 +2023,9 @@ class AnsibleModule(object):
         assert 'msg' in kwargs, "implementation error -- msg to explain the error is required"
         kwargs['failed'] = True
 
+        if not 'changed' in kwargs:
+            kwargs['changed'] = False
+
         self.do_cleanup_files()
         self._return_formatted(kwargs)
         sys.exit(1)