[Onboarding] yaml migration from existing ComfyUI install

[huchenlei]

This PR:

• Adds existing ComfyUI installlation's model path into desktop yaml config
• Adds existing ComfyUI installation's yaml file content into desktop yaml config

Example

Sample existing yaml:

#config for a1111 ui
#all you have to do is change the base_path to where yours is installed
a111:
    base_path: D:/stable-diffusion-webui/

    checkpoints: models/Stable-diffusion
    configs: models/Stable-diffusion
    vae: models/VAE
    loras: |
         models/Lora
         models/LyCORIS
    upscale_models: |
                  models/ESRGAN
                  models/RealESRGAN
                  models/SwinIR
    embeddings: embeddings
    hypernetworks: models/hypernetworks
    controlnet: models/ControlNet

Sample output yaml:

# ComfyUI extra_model_paths.yaml for win32
a111:
  base_path: D:/stable-diffusion-webui/
  checkpoints: models/Stable-diffusion
  configs: models/Stable-diffusion
  vae: models/VAE
  loras: |
    models/Lora
    models/LyCORIS
  upscale_models: |
    models/ESRGAN
    models/RealESRGAN
    models/SwinIR
  embeddings: embeddings
  hypernetworks: models/hypernetworks
  controlnet: models/ControlNet
comfyui:
  is_default: "true"
  checkpoints: |-
    models\checkpoints\
    D:\ComfyUI_windows_portable\ComfyUI\models\checkpoints\
  classifiers: |-
    models\classifiers\
    D:\ComfyUI_windows_portable\ComfyUI\models\classifiers\
  clip: |-
    models\clip\
    D:\ComfyUI_windows_portable\ComfyUI\models\clip\
  clip_vision: |-
    models\clip_vision\
    D:\ComfyUI_windows_portable\ComfyUI\models\clip_vision\
  configs: |-
    models\configs\
    D:\ComfyUI_windows_portable\ComfyUI\models\configs\
  controlnet: |-
    models\controlnet\
    D:\ComfyUI_windows_portable\ComfyUI\models\controlnet\
  diffusers: |-
    models\diffusers\
    D:\ComfyUI_windows_portable\ComfyUI\models\diffusers\
  diffusion_models: |-
    models\diffusion_models\
    D:\ComfyUI_windows_portable\ComfyUI\models\diffusion_models\
  embeddings: |-
    models\embeddings\
    D:\ComfyUI_windows_portable\ComfyUI\models\embeddings\
  gligen: |-
    models\gligen\
    D:\ComfyUI_windows_portable\ComfyUI\models\gligen\
  hypernetworks: |-
    models\hypernetworks\
    D:\ComfyUI_windows_portable\ComfyUI\models\hypernetworks\
  loras: |-
    models\loras\
    D:\ComfyUI_windows_portable\ComfyUI\models\loras\
  photomaker: |-
    models\photomaker\
    D:\ComfyUI_windows_portable\ComfyUI\models\photomaker\
  style_models: |-
    models\style_models\
    D:\ComfyUI_windows_portable\ComfyUI\models\style_models\
  unet: |-
    models\unet\
    D:\ComfyUI_windows_portable\ComfyUI\models\unet\
  upscale_models: |-
    models\upscale_models\
    D:\ComfyUI_windows_portable\ComfyUI\models\upscale_models\
  vae: |-
    models\vae\
    D:\ComfyUI_windows_portable\ComfyUI\models\vae\
  vae_approx: |-
    models\vae_approx\
    D:\ComfyUI_windows_portable\ComfyUI\models\vae_approx\
  animatediff_models: |-
    models\animatediff_models\
    D:\ComfyUI_windows_portable\ComfyUI\models\animatediff_models\
  animatediff_motion_lora: |-
    models\animatediff_motion_lora\
    D:\ComfyUI_windows_portable\ComfyUI\models\animatediff_motion_lora\
  animatediff_video_formats: |-
    models\animatediff_video_formats\
    D:\ComfyUI_windows_portable\ComfyUI\models\animatediff_video_formats\
  ipadapter: |-
    models\ipadapter\
    D:\ComfyUI_windows_portable\ComfyUI\models\ipadapter\
  liveportrait: |-
    models\liveportrait\
    D:\ComfyUI_windows_portable\ComfyUI\models\liveportrait\
  insightface: |-
    models\insightface\
    D:\ComfyUI_windows_portable\ComfyUI\models\insightface\
  layerstyle: |-
    models\layerstyle\
    D:\ComfyUI_windows_portable\ComfyUI\models\layerstyle\
  LLM: |-
    models\LLM\
    D:\ComfyUI_windows_portable\ComfyUI\models\LLM\
  Joy_caption: |-
    models\Joy_caption\
    D:\ComfyUI_windows_portable\ComfyUI\models\Joy_caption\
  sams: |-
    models\sams\
    D:\ComfyUI_windows_portable\ComfyUI\models\sams\
  blip: |-
    models\blip\
    D:\ComfyUI_windows_portable\ComfyUI\models\blip\
  CogVideo: |-
    models\CogVideo\
    D:\ComfyUI_windows_portable\ComfyUI\models\CogVideo\
  xlabs: |-
    models\xlabs\
    D:\ComfyUI_windows_portable\ComfyUI\models\xlabs\
  instantid: |-
    models\instantid\
    D:\ComfyUI_windows_portable\ComfyUI\models\instantid\
  custom_nodes: custom_nodes/
  base_path: C:\Users\hcl\Documents\ComfyUI

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[huchenlei]

Trivial tests are removed.