Test: Light Hight Contrast Theme

[daviddossett]

Refs: #143398

• macOS @alexdima
• linux @roblourens
• windows @luabud

Complexity: 3

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A new light high contrast theme was added to the default themes list accompany our dark high contrast theme. While there will be more work needed to react to OS-level light/dark HC modes, this first step simply adds the theme marked as "Beta" so we can collect early feedback on the theme itself.

Scenarios to test:

• Open a folder with at least a few folders/file. Verify text readability/contrast on main UI areas (sidebar, titlebar, tabs, quick pick, etc.)
• Open the terminal and run a few basic commands (e.g. npm i). Verify text readability/contrast on output.
• Open a file. Verify syntax token readability/contrast.
• Make a change and view the diff. Verify that changed lines are easily identified.
• Bonus: poke around the areas of the UI you are most familiar with to see if there are any obvious issues.

[isidorn]

Let's increase complexity to 3 since I think this can be time consuming :)