[MD] Change name of data source picker from cluster selector

[BionIT]

Is your feature request related to a problem? Please describe.
I got confused when using the cluster selector which is actually the data source picker

Describe the solution you'd like

Rename the name of the data source picker from cluster selector

Describe alternatives you've considered

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

Additional context

Add any other context or screenshots about the feature request here.