Breaking: #69795 - Unused DTM Tabmenu code removed

See Issue #69795

Description

All DynTabMenu JavaScript and CSS code which was previously used to render Tab Menus in the TYPO3 Backend has been removed without substitution.

Impact

All logic that requires EXT:backend/Resources/Public/JavaScript/tabmenu.js directly and/or use the JavaScript code of DTM_activate() or DTM_toggle() directly have been removed.

Affected Installations

TYPO3 Installations with custom extensions that use the logic mentioned above.

Migration

Use ModuleTemplate::getDynamicTabMenu() directly to use the Bootstrap-based API shipped with the TYPO3 Core.