[3.x] Remove hardcoded names in generated objects

[Shatur]

This is a 3.x version of #47271.

[akien-mga]

Force pushed to solve merge conflicts.

[akien-mga]

Should be fine to merge like the master PR was.

[akien-mga]

Thanks!

[jamie-pate]

FYI this is a breaking change for some workflows..

If you have created a new inherited scene , and then modified node properties. When updating to 3.5 the inherited scene will no longer modify the properties of the correct child object. (the name of the modified node is now incorrect)
(e.g. there's no xyz-rigid then it used to be named 'mesh' but now it's 'xyz-rigid'. In my case it's useful to hide this rigid body who's mesh should not be shown since there's no xyz-rigidcolonly import modifier pattern)

Probably should mention this in the release notes.

@fire

[fire]

Can you also post this in the documentation team so it doesn't get lost? I'm currently at Siggraph 2022.

[akien-mga]

It is mentioned in the curated changelog: https://github.com/godotengine/godot/blob/3.5/CHANGELOG.md#import

[jamie-pate]

It is mentioned in the curated changelog: https://github.com/godotengine/godot/blob/3.5/CHANGELOG.md#import

It's mentioned, but there's no note that it's a breaking change like some other changes..
(I commented on the commit earlier (rc6) but I guess that comment got lost since it wasn't on the PR)