Add workspace failed error section for FAILED/ERROR state workspaces in Workspace details page

MR: Pending

Description

To improve the workspace failure visibility & troubleshooting, we need to add a workspace failed error section to the workspace details page so that users can quickly understand why their workspace failed and see the relevant error information.

Visual Changes

Acceptance criteria

• Add "Workspace failed" error section that only displays for workspaces in FAILED/ERROR state
• Fetch & display the most recent error log message for the failed workspace
• Handle cases where error details are unavailable gracefully (hide the log & the button)
• Hide section completely for workspaces that are not in failed state
• Error message should be truncated for very long error logs with proper formatting

TODO: Implementation plan