[Multiple Datasource] Improvement on the empty state component for data source picker

[BionIT]

Is your feature request related to a problem? Please describe.
In #6420, we introduced no data source empty state component to mount when there is no available data sources. This component use the existing OUI components which don't look consistent with other components

Describe the solution you'd like

Introduce new icon components to mount for the empty state, and add button to the toast for manage data source

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

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