Workspace CPU and RAM columns

[paulovmr]

Add the "CPU" and "RAM" columns after the "Data Vol" column, to display CPU percentage and RAM amount usages.

To be defined:

• What backend service will return this information?

[senanz]

/assign

[github-actions]

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[ederign]

This issue is still planned for Notebooks 2.0.

[ederign]

/retitle Workspace CPU and RAM columns