Closes #19735: Implement reuable bulk operations classes (#19774)

* Initial work on #19735

* Work in progress

* Remove ClusterRemoveDevicesView (anti-pattern)

* Misc cleanup

* Fix has_bulk_actions

* Fix has_bulk_actions for ObjectChildrenView

* Restore clone button

* Misc cleanup

* Clean up custom bulk actions

* Rename individual object actions

* Collapse into a single template tag

* Fix support for legacy action dicts

* Rename bulk attr to multi

* clone_button tag should fail silently if view name is invalid

* Clean up action buttons

* Fix export button label

* Replace clone_button with an ObjectAction

* Create object actions for adding device/VM components

* Move core_sync.html to core app

* Remove extra_bulk_buttons from template doc

netbox/dcim/object_actions.py

@@ -0,0 +1,38 @@
+from django.utils.translation import gettext as _
+
+from netbox.object_actions import ObjectAction
+
+__all__ = (
+    'BulkAddComponents',
+    'BulkDisconnect',
+)
+
+
+class BulkAddComponents(ObjectAction):
+    """
+    Add components to the selected devices.
+    """
+    label = _('Add Components')
+    multi = True
+    permissions_required = {'change'}
+    template_name = 'dcim/buttons/bulk_add_components.html'
+
+    @classmethod
+    def get_context(cls, context, obj):
+        return {
+            'perms': context.get('perms'),
+            'request': context.get('request'),
+            'formaction': context.get('formaction'),
+            'label': cls.label,
+        }
+
+
+class BulkDisconnect(ObjectAction):
+    """
+    Disconnect each of a set of objects to which a cable is connected.
+    """
+    name = 'bulk_disconnect'
+    label = _('Disconnect Selected')
+    multi = True
+    permissions_required = {'change'}
+    template_name = 'dcim/buttons/bulk_disconnect.html'