Feature: #102836 - Allow deleting IRRE elements via postMessage()

See forge#102836

Description

To invoke a deletion on items in FormEngine's Inline Relation container API-wise, a new message identifier typo3:foreignRelation:delete has been introduced.

Example usage:

import { MessageUtility } from '@typo3/backend/utility/message-utility.js';

MessageUtility.send({
    actionName: 'typo3:foreignRelation:delete',
    objectGroup: 'data-<page_id>-<parent_table>-<parent_uid>-<reference_table>',
    uid: '<reference_uid>'
});
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Impact

Extension developers are now able to trigger the deletion of IRRE elements via API.