Allow custom colors for project names

[sheremet-va]

Clear and concise description of the problem

It is not possible to configure colors of the project names in UI or in the CLI.

Suggested solution

Allow accepting the name property as an object:

interface ProjectName {
  name: string
  color: keyof Colors
}

We should also change the default colors to be background ones by default (this was initially part of #6329):

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[AriPerkkio]

Related to #6338

[kevinmarrec]

@sheremet-va Vitest should provide somehow at minimum 2 colorsets (until custom colors for project names come out), following an accessible dark/light theme convention, because when running Vitest with workspaces, either in a terminal with dark background or in Github Actions with dark background, it's not accessible (especially on Github actions) :

[rgrove]

I was surprised to discover that in Vitest 3, project names are completely unreadable in my terminal with a dark color scheme. The big blank space on the left in the screenshot below is where (invisible) project names are printed. I've obscured the filenames on the right since this is a non-public codebase.

[kevinmarrec]

I think the first color picked is black :

vitest/packages/vitest/src/node/reporters/renderers/utils.ts

Line 226 in 9acc13f

const colors = [c.black, c.yellow, c.cyan, c.green, c.magenta]

@rgrove And I guess you're being pretty unlucky because your terminal background is exactly the same black color Vitest is using (from tinyrainbow library), so you don't see it at all 😵

[rgrove]

Yeah, that looks like the problem! Seems like this issue with dark backgrounds could be mitigated by removing black from the list of possible colors?

[kevinmarrec]

I guess it could be indeed a first step before letting us customize the colors from the config options.