Add expand/collapse toggle button for workspace list view

MR: Pending

Description

As part of our new designs for Workspaces, we need to add an expand/collapse toggle button on the top right of the workspace list page so that users can easily choose between viewing details of all workspaces or a more compact list view based on their preference.

Visual Changes

Acceptance criteria

• Add expand/collapse toggle button positioned in the top right of the workspace list page
• Toggle button has proper hover and focus states for accessibility
• Toggle buttons support gitlab shortcuts for expand (;)/collapse (shift + ;)
• Default state is defined (expanded or collapsed)

TODO: Implementation plan

Technical Notes

• Reference: Use or model after the existing toggle component in merge request file browser view