Comfy: Add configuration option to blacklist loading specific custom nodes

### Feature Idea When using Embedded Comfy(), we would like to exclude specific nodes from being loaded. We have a specific use case to disable ComfyUI-Manager from loading. This should be done using a class configuration so that the custom node is only excluded from loading in the Comfy() embedded runtime context ### Existing Solutions Currently we can rename a custom node folder to append `.disabled`, but this is not reliable enough for production use ### Other _No response_