Anim: add 'move bone to collection' operator to pose mode menu

Add the 'move bone to collection' operator to the pose mode menu. It was
already in the armature edit mode menu.

The operator was already available in the pose mode keymap, it just wasn't
discoverable via the menu.

scripts/startup/bl_ui/space_view3d.py

@@ -3887,6 +3887,7 @@ class VIEW3D_MT_pose(Menu):
         layout.separator()
 
         layout.menu("VIEW3D_MT_pose_motion")
+        layout.operator("armature.move_to_collection", text="Move to Bone Collection")
         layout.menu("VIEW3D_MT_bone_collections")
 
         layout.separator()