Windows Terminal version (or Windows build number)

1.12.2931.0

Steps to reproduce

As reported at #11325 (comment)

• Create this file at %LOCALAPPDATA%\Microsoft\Windows Terminal\Fragments\jan-config\wsl.json:

  {
      "$schema": "https://aka.ms/terminal-profiles-schema",
      "profiles": [
          {
              "updates": "{58ad8b0c-3ef8-5f4d-bc6f-13e4c00f2530}",
              //"name": "Debian",
              "colorScheme": "Nord",
              "hidden": false,
              "cursorShape": "underscore",
              "fontFace": "FantasqueSansMono Nerd Font",
              "fontSize": 16,
              "backgroundImage": "C:/Users/jantari/Openlogo-debianV2.svg - Kopie.png",
              "backgroundImageStretchMode": "none",
              "backgroundImageOpacity": 0.3,
              "backgroundImageAlignment": "bottomRight",
              "useAcrylic": false,
              "acrylicOpacity": 0.86,
              "source": "Windows.Terminal.Wsl"
          },
          {
              "updates": "{07b52e3e-de2c-5db4-bd2d-ba144ed6c273}",
              //"name": "Ubuntu 20.04",
              "colorScheme": "Nord",
              "hidden": false,
              "cursorShape": "underscore",
              "fontFace": "FantasqueSansMono Nerd Font",
              "fontSize": 16,
              "backgroundImage": "%LOCALAPPDATA%/WSL_ICONS/wt-wsl-ubuntu-logo.png",
              "backgroundImageStretchMode": "none",
              "backgroundImageOpacity": 0.3,
              "backgroundImageAlignment": "bottomRight",
              "useAcrylic": true,
              "acrylicOpacity": 0.86,
              "source": "Windows.Terminal.Wsl"
          }
      ]
  }

Expected Behavior

Settings load successfully.

Actual Behavior

Cause & Solution

The "updates" key is an alternative "guid" key for fragment profiles.
But SettingsLoader::_appendProfile stores and deduplicates profiles according to their "guid" only. We need to modify the function to optionally store profiles by their "updates" key instead, otherwise multiple fragment profile without "guid" might collide as they produce the same default GUID.