Generate design token output

Add Storybook stories
Generate design token output
Update GlAlert to use design token CSS custom properties

chore: Add neutral action tokens

See merge request gitlab-org/gitlab-ui!4306



Merged-by: Lukas 'ai-pi' Eipert <leipert@gitlab.com>
Approved-by: Dan MH <dmizzi-harris@gitlab.com>
Approved-by: Scott de Jonge <sdejonge@gitlab.com>
Reviewed-by: Scott de Jonge <sdejonge@gitlab.com>
Co-authored-by: sdejonge <sdejonge@gitlab.com>

feat(DesignTokens): add feedback color design tokens

Closes #2613

See merge request gitlab-org/gitlab-ui!4208



Merged-by: Lukas 'ai-pi' Eipert <leipert@gitlab.com>
Approved-by: Dan MH <dmizzi-harris@gitlab.com>
Approved-by: Thomas Hutterer <thutterer@gitlab.com>
Approved-by: Lukas 'ai-pi' Eipert <leipert@gitlab.com>
Reviewed-by: Scott de Jonge <sdejonge@gitlab.com>
Co-authored-by: GitLab Bot <gitlab-bot@gitlab.com>
Co-authored-by: sdejonge <sdejonge@gitlab.com>

# [85.2.0](gitlab-org/gitlab-ui@v85.1.0...v85.2.0) (2024-06-25)

### Features

* **DesignTokens:** add feedback color design tokens ([9a389d92](gitlab-org/gitlab-ui@9a389d92))