a few fix for SingleFile tests

[yiyixuxu]

This PR:

1. update the reference repo for single file config from Lykon/dreamshaper-8 to stable-diffusion-v1-5/stable-diffusion-v1-5. Lykon/dreamshaper-8 actually has a different config than the original SD1.5, which caused test failures such as https://github.com/huggingface/diffusers/actions/runs/10985616735/job/30497746524#step:6:30045
2. update the repo to stable-diffusion-v1-5/stable-diffusion-v1-5 and "stable-diffusion-v1-5/stable-diffusion-inpainting", the "Jiali/stable-diffusion-1.5" does not contain variant, which caused failures such as https://github.com/huggingface/diffusers/actions/runs/10985616735/job/30497746524#step:6:30048
3. fix a bug where we modify the mapping dict in-inplace

did not fix this https://github.com/huggingface/diffusers/actions/runs/10985616735/job/30497746524#step:6:30055
looked into it but it is what it is, for upcaler there is a discrepancy in sample_size config between vae and unet, we will decide when @DN6 is back

there are a lot of internet os errors that I cannot reproduce on my machine, so did not address in this PR. will look into if it persist

[HuggingFaceDocBuilderDev]

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[yiyixuxu]

making a copy that we won't accidently modify the DIFFUSERS_DEFAULT_PIPELINE_PATHS

so here is an example, we modified the output of fetch_diffusers_config in place

diffusers/src/diffusers/loaders/single_file_model.py

Line 264 in 28f9d84

subfolder = subfolder or config.pop(

this is likely to happen if it had not already, so we should go through the single file code and see if there are more places might cause this type of errors

[a-r-r-o-w]

Thank you, looks great! Good to see a separate org for maintaining the runway checkpoints 🥹

I've been looking at some failing tests too (such as this, and similar) but cannot replicate locally either. Will take a deeper look at some of the remaining failing tests soon too