…terPopover in actions (elastic#194600)

Resolve: elastic#192847

When user try to save the rule which has a conditional action with a
filter which contains AND or OR, it'll fail.
Error raises when a new rule SO object is going to be created.
Validation fails because schema is wrong.
I fixed it in this PR.

### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

### How to test

1. Go to Rules and try creating a new rule of any type
2. Add an action to the rule
3. Check the option If alert matches a query
4. Click the + icon to add a filter
5. Create a filter in the popover
6. Click AND or OR
7. Create another filter
8. Click Add filter
9. Try saving the rule
10. Saving should be successful

(cherry picked from commit 02d0c98)