UI Dashboard Import : Allow user to select bucket

__Proposal:__
During the import/create Dashboard process, allow the user to select a new data bucket to map all the cell queries

__Current behavior:__
When you import a Dashboard, if there is no matching bucket, the user needs to manually edit every cell in the dashboard to pull from the desired bucket

__Desired behavior:__
Allow the user to select from the local bucket list to re-map all the queries [for dashboards that have cells that query different buckets, this would only be a partial solution, but still better than every cell being broken)

__Alternatives considered:__

__Use case:__
-- User has to duplicate dozens of dashboards, each with dozens of cells, to a new setup with different data buckets