Do not error on Load Warnings, but instead just log them.

[BigRoy]

Changelog Description

Do not error on Load Warnings, but instead just log them.

• This allows the workfiles tool to not show a red "Failed to open workfile" message if the scene just opened with warnings.
• Also avoids errors in "open_workfile" from headless mode if the file did open, but just had warnings

Additional review information

Instead of showing an error pop-up scene warnings like:

Skipping unrecognized parameter "load_refresh".
Skipping unrecognized parameter "load_message".             

Will now just be logged instead of prompted to the user.

Testing notes:

1. Open scene with HDA that has changed in the meantime (e.g. has parameters removed that were previously overridden in the existing file)

[MustafaJafar]

It works.
maybe the easy way to test is to open hip file with an older Houdini version.

---

about the log.warning(exc) what does it do?
in both develop and this branch I got the warning printed like

WARNING:ayon_houdini:Warnings were generated during load.
Error loading: //storage/work/ayon/RnD/features/flipbook_node/work/Generic/rnd_flipbook_node_Generic_v002.hip
Warning:     

/obj/cam1/xform1:

             Skipping unrecognized parameter "movepivot".
             Bad node type found: flipbook in /out.

which is much similar to this window. (for information, when opening the file directly from the launcher, I get this window. but when using the workfile tools in ayon, I never get it again.)

however in develop branch I can find more things in Houdini console like:

==============================
Traceback (most recent call last):
  File "E:\Ynput\ayon-core\client\ayon_core\tools\workfiles\control.py", line 535, in open_workfile
    self._open_workfile(folder_id, task_id, filepath)
  File "E:\Ynput\ayon-core\client\ayon_core\tools\workfiles\control.py", line 698, in _open_workfile
    self._host_open_workfile(filepath)
  File "E:\Ynput\ayon-core\client\ayon_core\tools\workfiles\control.py", line 631, in _host_open_workfile
    host.open_workfile(filepath)
  File "E:\Ynput\ayon-houdini\client\ayon_houdini\api\pipeline.py", line 115, in open_workfile
    hou.hipFile.load(filepath,
  File "C:\PROGRA~1/SIDEEF~1/HOUDIN~1.805/houdini/python3.9libs\houpythonportion\ui.py", line 1119, in decorator
    return func(*args, **kwargs)
  File "C:\PROGRA~1/SIDEEF~1/HOUDIN~1.805/houdini/python3.9libs\hou.py", line 52171, in load
    return _hou.hipFile_load(self, file_name, suppress_save_prompt, ignore_load_warnings)