fix misplaced configs saving

[eaidova]

What does this PR do?

during diffusion pipeline loading, _name_or_path field overridden only for main pipeline config, while its components still contains paths for original pipeline. As te result, ioriginal config loaded using diffusers pytorch pipeline and saved on disk for ov diffusers pipeline are different (e.g. for too old models where config does not contains some important fields) it may lead to incorrect loading.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests?

[eaidova]

@l-bat could you please review

[HuggingFaceDocBuilderDev]

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[AlexKoff88]

It looks like that the logic in the tests should be changed as well

[l-bat]

Thanks!

[eaidova]

@echarlaix @IlyasMoutawwakil could you please take a look?

[echarlaix]

Thanks @eaidova