[Coachmark][a11y]: subtle animation should support prefers-reduced-motion media query

[majornista]

Description

Coachmark continues to animate subtly despite the prefers-reduced-motion user preference.

Steps to reproduce

1. Using Chrome, go to https://opensource.adobe.com/spectrum-css/coachmark.html
2. Open Developer Tools > Rendering
3. Under Emulate CSS media feature prefers-reduced-motion, select "prefers-reduced-motion: reduce"

Expected behavior

Coachmark elements should not continue to vibrate.

Screenshots

Environment

• Spectrum CSS version: @spectrum-css/[email protected]
• Browser(s) and OS(s): Chrome 114.0.5735.106 (Official Build) (arm64) on macOS

Additional context

• https://www.w3.org/WAI/WCAG21/Understanding/animation-from-interactions
• https://www.w3.org/WAI/WCAG21/Techniques/css/C39