Fix site setup access at toolbar by using @actions endpoint.

[Faakhir30]

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Closes #6355

Avoiding calling Actions get API again by passing through the parent component, as the toolbar already has access to actions.

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[stevepiercy]

Sprinkle a little MyST syntax for the change log. Otherwise LGTM, but needs a technical review.

[JeffersonBledsoe]

I'll test over the weekend, but the code seems fine apart from using lodash