Add 'headlamp-k8s' to plugin names in package.json

[skoeva]

Is your feature request related to a problem? Please describe the impact that the lack of the feature requested is creating.

Yes, follow up to #2572

Describe the solution you'd like

Add 'headlamp-k8s' as the org name for plugins (i.e. @headlamp-k8s/app-catalog)

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