Allow access to page to order book page's children

This is Joachim's module ported to D10 as a patch for the Book module.

Seems like a change that should have test coverage.

Added some test coverage

Tested on Drupal 10.3 with standard install profile (claro admin theme).

From what I see, this mostly works, but not totally. Explanation below.

Testing steps:

1. Created a book with a child page and children for that child page.
2. Added "administer book outlines" and "Reorder child page of a book" permissions to a role.
3. Logged in as a user with the role from step 2 and navigated to /node/{node_id}/child-ordering.
4. Tried to reorder the items by dragging and dropping.
5. The drag and drop doesn’t work as expected. You can reorder the items, but only by dragging the item you want to move to the left, not up or down. (see screenshot).
6. Changing row weights manually does work as expected.

Moving back to needs work.

When you enter the menu, Changing row weights manually works np.

smustgrave → closed merge request !39

Automatically closed - issue fixed for 2 weeks with no activity.