Test: LCD rendering

[bpasero]

Refs: #84715

• Linux @octref
• Windows @sbatten

Complexity: 3

This milestone we worked on making each part of the workbench render with subpixel-antialiasing. Currently the only way to find out is by making a screenshot and zooming in enough to see pixel rendering.

Here you can see the before (up - greyscale) and after (down - notice the colored pixels):

Run through our UI (all views, all panels, all editors, status, title, activity bar) and find areas where you notice greyscale rendering.

Note: already known issues are that quick open and notifications render with greyscale. Use the lcd-text-rendering label and query to find existing issues!

[octref]

One thing I'm not sure is if we count webviews such as Markdown Preview as part of our workbench UI. Currently text there are using greyscale rendering.