Revert "Revert "XWIKI-8320: Delete space should list all pages that are going to be deleted""

This reverts commit de9cad44399d8d0e16c52884f599e0b71801532e.
XWIKI-8320: Delete space should list all pages that are going to be deleted
- Using the livetable macro
- Cleaned indentation
- Added a generic light template-based data source (getdocuments.vm) for the livetable to be used in templates