Allow core post content block within wp-curate/query block

### Description

The `core/post-content` block is currently only allowed inside of the `core/query` block (see https://wordpress.org/documentation/article/post-content-block/). It would be great if this block was also allowed to be inserted inside the `wp-curate/query block` (within a post template), similar to other `post-` blocks.

### Use Case

As an editor, I want to curate a list of events on a landing page. The event details and call to action is all within the event's post content, so I need to be able to add this to the post template within the query block.

### Acceptance Criteria

- Ensure the Post Content block is available in the inserter inside of the Post Template block in a WP Curate Query block.