Modal: Applying animation to the modal launch/close action

[andrew-ronaldson]

Prerequisite to patternfly/patternfly-react#12552

Define animation tokens to be used to achieve the desired effect.

Considerations:

• Backdrop animations?

• In/out transition speeds

• Reduced motion fallbacks?

• Animate up or down?

---

Jira Issue: PF-4471

[patternfly-jira-sync]

Closed via Jira sync - Jira issue PF-4471 was closed.