Remove deprecated ImageIOConfigModel from settings

Is there an existing issue for this?

[X] I have searched the existing issues.

Please describe the feature you have in mind and explain what the current shortcomings are?

Currently the settings for ayon-houdini contains a deprecated ImageIOConfigModel.

With the support of profiles to determine OCIO config in ayon-core this logic has been superseded and should be removed from each addon still having the deprecated settings.

How would you imagine the implementation of the feature?

Remove the deprecated settings, and ensure transition for existing users is easy. Since settings have moved, in a potentially backwards incompatible way, there may need to be a transition guide with the release explaining what to do. We may need to also bump the minor version to indicate the breaking changes.

Are there any labels you wish to add?

[X] I have added the relevant labels to the enhancement request.

Describe alternatives you've considered:

No response

Additional context:

Part of the cleanup epic ✨

ynput / ayon-houdini

Remove deprecated ImageIOConfigModel from settings #46