XWIKI-11416: Move the "Pretty Name" and Description sections from the Main Wiki to their respective subwiki Administration page

- Modified permission checks in the script service for editing a wiki descriptor. Allowed are:
 - Users with edit rights on the descriptor's document (that includes global admins)
 - Owner of the wiki corresponding to the descriptor
 - Local admins of the wiki corresponding to the descriptor, as long as they do not change the "ownerId" property
- Updated and added new tests
- Added a 'Wiki' administration section that exposes this UI, under the 'Configuration' category
- Packaged this new UI elements in a new UI module that is common to both the main wiki and subwikis and which will be included in XE's common UI.