Fix linking ifc from shared folder on Windows #5386

The problem was that shared folders names are starting with `\\`, e.g. `\\SERVERNAME\shared_folder`. When we pass path strings we usually sanitize them and save them as posix, so it's saved as `//SERVERNAME/shared_folder` and Blender has a convention that paths starting with `//` it interprets as filepaths relative to the current .blend file, therefore it was giving some weird error that `C:\Users\xxxx\SERVERNAME\shared_folder\test.blend` is missing instead of `\\SERVERNAME\shared_folder`.

So need to be careful passing strings to Blender operators and use str instead of as_posix for those operators, so  \\` wouldn't be misinterpreted.

src/bonsai/bonsai/bim/module/project/operator.py

@@ -1142,7 +1142,8 @@ def run():
     pprops.false_origin = "{pprops.false_origin}"
     pprops.project_north = "{pprops.project_north}"
     bpy.ops.bim.load_linked_project(filepath="{self.filepath}")
-    bpy.ops.wm.save_as_mainfile(filepath="{blend_filepath.as_posix()}")
+    # Use str instead of as_posix to avoid issues with Windows shared paths.
+    bpy.ops.wm.save_as_mainfile(filepath=r"{str(blend_filepath)}")
 
 try:
     run()