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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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You know one of the easiest and safest ways of switching base os? Replace the ssd (or m.2).
They're ridiculously cheap now and, after copying the installer files to a usb stick, unplug your old ssd and plug in the new one. Then you can go back fully if it doesn't work out.
And you can get a cheap enclosure for the old m.2 or SSD to copy files you need off the old one.
I am unsure of what or how many files you need but ever think about using something like a flash drive to save your files to it and then wiping drive? I know sometimes you get so caught up with complex problems that you forget about the simple solutions.
I need basically just my config files since projects are on gitlab. I will probably just zip them all up and store in cloud storage on dropbox and then redownload or try to access the ubuntu home paritition from Garuda if that is possible.
I recommend using Transwiz to zip up your user profile, you can move the .trans.zip file to a neutral location (external drive, network storage, etc). Of course if you have valuable information stored outside the C:\Users folder, back it up as well. Now you should have a system you can safely mangle, destroy and rebuild without worrying about user data. Once you've built your new setup, extract the zip folder into /home/[your_name] or ~ and you're all set.
Make absolutely sure that you're not touching the ubuntu partition while getting rid of windows.
A backup of at least your home directory is recommended.
Then just remove the windows partition from ubuntu and install garuda to it as usual. You'll probably need to use grub-mkconfig after installation to make sure grub shows both ubuntu and garuda. The arch wiki has a good guide on that.