Allow passing config_file argument to ControlNetModel when using from_single_file

[DN6]

What does this PR do?

Similar fix to : #6950

Fixes # (issue)

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[sayakpaul]

I don't think it makes the difference between original_config_file and config_file quite clear. Could you rephrase?

[DN6]

They both mean the same thing. We used original_config_file in the pipeline Mixin.

With the refactor, the internal logic config_file = kwargs.pop("config_file") was removed in favour of using original_config_file like we do for the Pipelines.

But UI's like SD.Next use config_file when loading the VAE. Putting it back here again for backwards compatibility.

We don't need to keep both. We can deprecate one of them.

[sayakpaul]

Okay. Then maybe in a follow-up PR, let's start their deprecation cycles?

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