Library theming: Update Spinner component in design kit

[evwilkin]

Update the Spinner component in the PatternFly design kit to align with the unified theme. Update Figma files, styles, documentation, and ensure unified visual consistency throughout.

Deliverables:

• Update tokens

• Include new variants

• Update branded icons

---

Jira Issue: PF-3786

[evwilkin]

Closed via Jira sync - Jira issue PF-3786 was closed.

[evwilkin]

Closed via Jira sync - Jira issue PF-3786 was closed.

[patternfly-jira-sync]

Closed via Jira sync - Jira issue PF-3786 was closed.