Update redux store with default plugins from CR without refreshing dashboard

[dkwon17]

Is your enhancement related to a problem? Please describe

From eclipse-che/che-dashboard#426, the default DevWorkspace plugins in the Redux store are only set on the preload phase (here). As a result, changes to the default plugins list (ie. server.workspacesDefaultPugins in the Che CR) are only updated in the Redux store when refreshing (F5) the Che dashboard.

It would be great if the default plugins are updated in the Redux store when they are changed in the Che CR without having to refresh the dashboard.

Describe the solution you'd like

Use an approach similar to watching changes: https://github.com/eclipse-che/che-dashboard/blob/main/packages/dashboard-frontend/src/services/bootstrap/PreloadData.ts#L115

Add a function similar to watchInNamespace from workspace-api.ts, to serverConfigApi.ts to watch for changes to server.workspacesDefaultPugins in the Che CR.

Additional context

Related issue: #20090
Related PR: eclipse-che/che-dashboard#426

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