Breaking: #96041 - Toolbar items: Register by tag 

See forge#96041

Description 

Toolbar items implementing \TYPO3\CMS\Backend\Toolbar\ToolbarItemInterface are now automatically registered by adding the tag backend.toolbar.item, if autoconfigure is enabled in Services.yaml.

Impact 

The registration via $GLOBALS['TYPO3_CONF_VARS']['BE']['toolbarItems'] isn't evaluated anymore.

Affected Installations 

Every extension, that adds toolbar items via $GLOBALS['TYPO3_CONF_VARS']['BE']['toolbarItems'] in its ext_localconf.php file.

Migration 

Remove $GLOBALS['TYPO3_CONF_VARS']['BE']['toolbarItems'] from your ext_localconf.php file. If autoconfigure is not enabled in your Configuration/Services.(yaml|php), add the tag backend.toolbar.item to your toolbar item class.

Example:

VENDOR\Extension\ToolbarItem\YourAdditionalToolbarItem:
  tags:
    - name: backend.toolbar.item
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