Update shadows to spec, and add to toast and tooltip.

See merge request !4628



Merged-by: Jose Ivan Vargas <jvargas@gitlab.com>
Approved-by: Jannik Lehmann <jlehmann@gitlab.com>
Approved-by: Ian Gloude <igloude@gitlab.com>
Approved-by: Jose Ivan Vargas <jvargas@gitlab.com>
Approved-by: Austin Regnery <aregnery@gitlab.com>
Co-authored-by: GitLab Bot <gitlab-bot@gitlab.com>
Co-authored-by: danmh <dmizzi-harris@gitlab.com>

# [94.1.0](v94.0.1...v94.1.0) (2024-09-24)

### Features

* **Elevation:** Clearer defined and more refined shadows ([635b4168](635b4168))
* **GlToast:** Add shadow to communicate elevation ([942ab0f7](942ab0f7))
* **GlTooltip:** Add shadow to communicate elevation ([bf53d96c](bf53d96c))