Please make this extension more colorblindness-friendly

The test explorer is working just fine in my VS code thanks, but as a colorblind developer, I find it really difficult to find passing/failing tests in the explorer view. I think that the curly-braces used to indicate namespaces and/or test suites turn red or green depending upon pass/fail, but I have an incredibly difficult time seeing the difference between them. I know that the icons inside are either tick/cross and that's fine, but it means I have to expand every suite to find the failing ones.

## Suggestions

* Make the colors configurable, perhaps with presets suitable for the various forms of colorblindness
* For the red braces, invert the icon's background/foreground (so it's a white brace inside a red background square). This way the icon is noticeably different from the green braces even if the developer is unable to perceive color.
* Use shades of red/green with markedly different lightness (for example a very pale/faint green, but a bold/solid red). This way they are distinguishable by lightness even if the developer cannot do so by hue

## Workaround

For now, what I am doing is ensuring that the "Add to Problems" setting is enabled. This way, I can find the failing tests that way, instead of using the explorer. It does make the explorer a little less useful though.