Add to workspace using multi-select

[adam-wolfe]

Is your feature request related to a problem? Please describe.

As a user interested in setting up a workspace that contains several different PDSs, I need to right click on each PDS to add it to my workspace.

Describe the solution you'd like

It would be great to be able to select multiple data sets (or USS directories) and add them all to my workspace with a single context menu action.

Describe alternatives you've considered

Right-clicking each data set works, but is not ideal.

Additional context

If you select multiple data sets, and click "Add to workspace" from the context menu, only one of the data sets you have selected is added to the workspace.

[github-actions]

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