Correct rebase of multi-delete branch
- Add responsiveness to 'Delete selected' button.
- Add custom styling for checkboxes to match pre-existing ones and fit UI.
- Make Delete.php display all selected wikis for deletion in table.
- Add ability to select and delete multiple wikis with streamed logs of outcome.
- Add ability to view logs when deleting multiple wikis regardless of back-end.
- Include indeterminate state for wiki deletion checkbox.
- Linked deletion actions to both individually selected and bulk selected wikis.
- Allow admin multi-delete actions
Bug: T395820
Related to T395820