feat(ws): Add "Connect" column to workspace table and display popup with workspace endpoints.

[Yael-F]

Fixes #150
This PR adds a "Connect" column to the workspace table, positioned before the Actions column.
The new column displays a list of endpoints on hover.

I've added a screenshot of the implementation. Please let me know if any further changes are needed.

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[Yael-F]

Following a discussion with @jenny-s51, we've decided to move the endpoints into the expanded table row.

The updated screenshot:

[thesuperzapper]

@Yael-F The intention of this button is to connect to the notebook instance (open a new tab), making it the single most important button on the page, it must be in the main row.

The design I was thinking was a button with dropdown to select which port to connect to.

NOTE: replace "Primary" with "Jupyter" (or whatever the first port is called), and the other actions being the other ports (or greyed out if there is only one).

NOTE 2: we might also want some kind of "connect" icon on the left side of the button, but I am not sure if that will just clutter.

[ederign]

@Yael-F I agree with @thesuperzapper! That is the primary action when I open the workspaces listing.