reset defaults for json filters (#76349)

* reset defaults for json filters

  these had change on unification of json parsing/dumping
  now they behave like before, but are still controllable by user.

changelogs/fragments/json_filter_fix.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - to_json/to_nice_json filters defaults back to unvaulting/no unsafe packing.

lib/ansible/plugins/filter/core.py

@@ -65,6 +65,13 @@ def to_nice_yaml(a, indent=4, *args, **kw):
 
 def to_json(a, *args, **kw):
     ''' Convert the value to JSON '''
+
+    # defualts for filters
+    if 'vault_to_text' not in kw:
+        kw['vault_to_text'] = True
+    if 'preprocess_unsafe' not in kw:
+        kw['preprocess_unsafe'] = False
+
     return json.dumps(a, cls=AnsibleJSONEncoder, *args, **kw)