Remove hardcoded names in generated objects

[Shatur]

When a node is added to the scene, it is automatically assigned the correct name depending on the node naming scheme settings. So if I understand correctly, calling set_name doesn't make any sense.

Closes #35690.

[fire]

The reasoning this is a good change is because we have default generated node names and when we override the default it should give additional information. The current design doesn't give additional information.

[akien-mga]

Thanks!