Hide Grid Action Separators for Users Lacking Sufficient Action Permissions

[danielstorch]

The grid action separators should not be shown if the associated action is not rendered due to missing user rights. Currently, when actions are added using "requireRight" and separated in the UI, the separators are displayed regardless of the user's permissions. This results in multiple separators being shown without any corresponding actions.

Expected behavior:
The separators should not be visible if no action is rendered.

[danielstorch]