move initialization of onnx pipelines & create onnx folder automatically

modules/shared_items.py

@@ -27,9 +27,6 @@ def list_crossattention():
 def get_pipelines():
     import diffusers
     from installer import log
-    from modules.onnx_impl import initialize as initialize_onnx_pipelines
-
-    initialize_onnx_pipelines()
 
     pipelines = { # note: not all pipelines can be used manually as they require prior pipeline next to decoder pipeline
         'Autodetect': None,