Automatically Set the Scale by value when user selects an Upscale Model

[Haoming02]

Description

^Edited

What you're trying to accomplish
Since the majority of the upscale models are named with its scaling factor (eg. 4x-UltraSharp or DAT x2), this PR makes it automatically set the appropriate Scale by value when user selects a model with that pattern.

A summary of changes in code
When setting up the UI, add a function that utilizes the gradio input method to check for the above condition via re, then set the value if possible. This feature is toggleable in the Settings.

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests

[w-e-w]

this behavior is controversial some might find it useful others might find it annoying, there must be an option to toggle this behavior
I don't know whether the default should be enabled or disabled, (some might like it, but I personally would find this annoying)

... pattern of [scale]x[name/architecture] ...

while that may be true for modues downloaded from OpenModelDB, but I think none of the models we provide by default follow this pattern, I think the match pattern should be more general

[catboxanon]

I agree with w-e-w. The intent behind this PR makes sense, but frankly most users aren't going to care what upscale factor the model was trained on, and are going to want to upscale an image by the factor they desire.