Remove confusing USER prefix from script-logged errors

[CreatedBySeb]

Removes the USER prefix prepended by certain logging functions when pushing an error manually from scripts, as per discussion in #96086. This prefix was only present in some places, and could be confusing as to the actual source of the error.

Fixes #96086

[akien-mga]

Looks good to me.

[RedMser]

From what I can tell, this makes the p_editor_notify parameter unused for these places.
I don't know if it should be removed, since I'm not sure what information it exactly conveys, but just pointing out that it could be removed, if it is not deemed useful anymore.

[akien-mga]

From what I can tell, this makes the p_editor_notify parameter unused for these places. I don't know if it should be removed, since I'm not sure what information it exactly conveys, but just pointing out that it could be removed, if it is not deemed useful anymore.

See #96086 (comment).

That's a minor annoyance of deeply nested OO stuff :)

(If you have an idea for how to refactor all this code to avoid passing around a bool in 35 files that's used only once, that's worth doing though.)

[akien-mga]

Thanks! And congrats for your first merged Godot contribution 🎉