Revert "GDScript: Fix groups and categories been seen as members"

This reverts commit 6f2a8434c6.

The commit introduces a bug where it creates spurious entries for member
information.

modules/gdscript/tests/scripts/runtime/features/groups_are_not_properties.gd

@@ -1,11 +0,0 @@
-# https://github.com/godotengine/godot/issues/73843
-extends RefCounted
-
-@export_group("Resource")
-@export_category("RefCounted")
-
-func test():
-	var res = Resource.new()
-	var ref = RefCounted.new()
-	prints("Resource class not shadowed:", res is Resource)
-	prints("RefCounted class not shadowed:", ref is RefCounted)

modules/gdscript/tests/scripts/runtime/features/groups_are_not_properties.out

@@ -1,3 +0,0 @@
-GDTEST_OK
-Resource class not shadowed: true
-RefCounted class not shadowed: true