Overriding Pikaday styles with setting variables and overriding CSS
classes

feat(GlDatePicker): Update action design tokens

Use design tokens in GlDatepicker - Pika styles

See merge request !4345



Merged-by: Scott de Jonge <sdejonge@gitlab.com>
Approved-by: Thomas Hutterer <thutterer@gitlab.com>
Approved-by: Scott de Jonge <sdejonge@gitlab.com>
Approved-by: Dan MH <dmizzi-harris@gitlab.com>
Reviewed-by: Thomas Hutterer <thutterer@gitlab.com>
Reviewed-by: Scott de Jonge <sdejonge@gitlab.com>
Co-authored-by: GitLab Bot <gitlab-bot@gitlab.com>
Co-authored-by: Vanessa Otto <votto@gitlab.com>

# [88.5.0](gitlab-ui@v88.4.1...v88.5.0) (2024-08-09)

### Features

* **GlDatepicker:** Use design tokens in GlDatepicker ([e33a3054](gitlab-ui@e33a3054))