[UX] Include the "+ Add condition" link/button and the "Remove"/"Configure" links in the "Conditions" fieldset of the

Basically replicate the same fieldset (w/o the help text perhaps) from the dialog inside the .layout-editor-block-content div:

- It would not complicate the UI since that fieldset is collapsed by default. - It would save the user a couple of clicks if they wanted to either add a condition or edit/remove any existing ones.