USD Contribution Workflow: Show/hide attributes per instance based on status of other toggles

[BigRoy]

Changelog Description

Show/hide attributes per instance for the USD contribution workflow based on status of other toggles in the Publisher UI.

Additional info

Replaces PR #943 which I couldn't seem to retarget to develop anymore

Testing notes:

1. Create USD instance in Maya, Houdini or Blender
2. The attributes should update on toggling on/off the toggles for Contribution Worfklow.
3. Extra test: USD Look publishing in Houdini should still work.

See screenshots:

[MustafaJafar]

It works in Houdini but, there's a weird error print in the console.
This error was printed 25 times when I refresh the publisher .

ERROR:CreateContext:Failed to get attribute definitions from plugin 'CollectUSDLayerContributionsHoudiniLook'.
Traceback (most recent call last):
  File "E:\Ynput\ayon-core\client\ayon_core\pipeline\create\context.py", line 1254, in bulk_add_instances
    attr_defs = plugin.get_attr_defs_for_instance(
  File "E:\Ynput\ayon-core\client\ayon_core\plugins\publish\extract_usd_layer_contributions.py", line 606, in get_attr_defs_for_instance
    layer_def = next(d for d in defs if d.key == "contribution_layer")
StopIteration

also, the attributes UI of the look product looks weird

Here's a reference about how it should look like

[MustafaJafar]

Tested in Houdini, Maya and Blender. It works.
The issue mentioned in my previous comments shows only in Houdini.

[MustafaJafar]

It works in Houdini but, there's a weird error print in the console. This error was printed 25 times when I refresh the publisher .

ERROR:CreateContext:Failed to get attribute definitions from plugin 'CollectUSDLayerContributionsHoudiniLook'.
Traceback (most recent call last):
  File "E:\Ynput\ayon-core\client\ayon_core\pipeline\create\context.py", line 1254, in bulk_add_instances
    attr_defs = plugin.get_attr_defs_for_instance(
  File "E:\Ynput\ayon-core\client\ayon_core\plugins\publish\extract_usd_layer_contributions.py", line 606, in get_attr_defs_for_instance
    layer_def = next(d for d in defs if d.key == "contribution_layer")
StopIteration

I furtherly checked this, firstly I added a print statement inside the CollectUSDLayerContributionsHoudiniLook.get_attr_defs_for_instance
and the print didn't show up for those 25 times I was talking about.
therefore, the "contribution_layer" doesn't exist all the times resulting the next to fail to find any values which is a lot similar to

next(i for i in range(4) if i > 5)

---

Edit 1: the error is gone when adding the following condition before this line

if not defs:
    return

[BigRoy]

Thanks so much for catching that @MustafaJafar. Fixed with 11bb657

[MustafaJafar]

Thanks so much for catching that @MustafaJafar. Fixed with 11bb657

Cool The error has disappeared.

[BigRoy]

Please review @iLLiCiTiT and merge if happy with the changes.

[iLLiCiTiT]

Codewise looks ok. If it works happy to merge.