Add book outline operation
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3573793. --> Reported by: [codebymikey](https://www.drupal.org/user/3573206) Related to !162 !163 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>When viewing books, it'd be nice if the Book outline was also available as an operation.</p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <p>View books under the <code>/admin/structure/book</code> page.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Add a new operation for the <code>entity.node.book_outline_form</code> route, so that they can easily go to the Outline, and potentially move the child node into a different Book.</p> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <p>Provide MR.</p> <h3 id="summary-ui-changes">User interface changes</h3> <p>N/A</p>
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