"Run and Debug" welcome view is misleading for virtual workspaces

[weinand]

Testing #18092

As part of testing #18092 I was opening a Python file and then switched to the "Run and Debug" viewlet where I was offered the following "Welcome" view:

.. and when pressing the "Run and Debug" button I got this:

Since Python is already running, sending me to the Marketplace is not really helpful...

IMO the bottom part:

is OK but the top part is not:

None of these suggestions make sense when no debugger is available.