Update workspace list component from compact list items to expanded card layout

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MR: Pending

Description

As part of our new designs for Workspaces, we want the workspace list to use a card-based layout instead of the current compact list format so that workspace information is more visually organized and scannable.

Visual changes

Before	After

Acceptance criteria

• Workspace list displays each workspace as a gl-card rather than a list item
• Cards have proper visual separation with appropriate padding and spacing
• Card layout maintains responsive design across different screen sizes
• Hide this change behind a wip feature flag

TODO: Implementation plan