Allow for Expands macro to nest inside Excerpts Macro

In the new Confluence editor, we are no longer allowed to put and Expands macro inside of an excerpts macro.  This was working in the old Confluence editor.

Steps to reproduce:

1. Create or Edit and new editor page in confluence cloud
2. Add an excerpt macro
3. put your cursor in the excerpt macro
4. add an expands macro

Expected results:

Expands macro box is created inside the excerpts macro .

Results:

Expands macro box is created outside of the excerpts macro.