Docked nav: Add expandable nav items to Docked nav - React follow-up

[patternfly-jira-sync]

React follow-up work for PF-4394 (Docked nav: Add expandable nav items to Docked nav).

Implement the React component changes needed to support expandable nav items in the docked nav.

See original ticket: https://redhat.atlassian.net/browse/PF-4394

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Jira Issue: PF-4432

[coderabbitai]

🔗 Related PRs

#12327 - feat(Page): added responsive docked nav [merged]
#12358 - chore(docked content): replaced dock class with docked [merged]
#12382 - feat(Compass): added responsive docked compass [merged]
#12444 - feat(NavExpandable): allow option to pass an icon [merged]
#12523 - fix(ExpandIcon): Replace ExpandIcon with RhUiExpandIcon [merged]

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