Test: Language-specific settings filter in the Settings editor

[rzhao271]

Refs: #131707

• anyOS @isidorn
• anyOS @joyceerhl

Complexity: 4

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We now support a language filter in the Settings editor. This filter allows one to view and modify language-specific settings.

1. Navigate to the Settings editor.
2. Type a language filter such as @lang:css into the search widget.
3. All language-overridable settings should show up.
4. Let's say you're in the User tab with the @lang:css filter. The setting value that should show up for a simple setting such as editor.tabSize is as follows:
   • If you set a language-specific value in the user settings file for that setting, that value should be rendered.
   • Otherwise, if an extension you have or wrote contributes a default language-specific value for that setting, that value should be rendered. You can hit this case by writing/modifying an extension that adds on a configurationDefaults object within the contributes section, where within the configurationDefaults object, you add an object with a key such as [css] to represent the language-specific default values. An example is at https://github.com/microsoft/vscode/blob/main/extensions/css-language-features/package.json#L901.
   • Otherwise, if there is a plain user settings value for that setting, that value should be rendered.
   • Otherwise, the default value of that setting should be rendered.
5. In the workspace tab, the value that should show up is similar to point 4 above, though the precedence order would be language-specific workspace value > language-specific default value > workspace value > default value.
6. Verify that for language-specific values, one must manually reset the value in order for the language override value to disappear from the settings json file.