Generate design token output

feat(DesignTokens): update overlap background color to color.neutral.900

See merge request gitlab-org/gitlab-ui!4640



Merged-by: Vanessa Otto <votto@gitlab.com>
Approved-by: Dan MH <dmizzi-harris@gitlab.com>
Approved-by: Chad Lavimoniere <clavimoniere@gitlab.com>
Approved-by: Vanessa Otto <votto@gitlab.com>
Reviewed-by: Scott de Jonge <sdejonge@gitlab.com>
Co-authored-by: sdejonge <sdejonge@gitlab.com>

# [94.6.0](gitlab-org/gitlab-ui@v94.5.0...v94.6.0) (2024-10-01)

### Features

* **DesignTokens:** update overlap background color to color.neutral.900 ([e0a8b98a](gitlab-org/gitlab-ui@e0a8b98a))