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) :