handle multiple templates in case of SQL DB

[sahuroshan]

In case the assesed instance has more than 50 dbs then instead of one template we will be getting list of templates from the nuget, This PR is to handle that change only.

Added test case for next gen gp recommendation and for mutiple templates case as well.

ADO task link - https://msdata.visualstudio.com/Database%20Systems/_workitems/edit/3100628

[github-actions]

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[Ramudaykumar]

Looks good to me.