Title missing for code-server and console tiles

[krassowski]

The title is empty for vscode and console tiles and the former causes nebari tests to fail (nebari-dev/nebari#2468 (comment)):

This is implemented here:

https://github.com/nebari-dev/jupyterlab-new-launcher/blob/dbf5f857a6bf4ae88a3c4873ac5014a67e95c834/src/components/card.tsx#L17

Upstream falls back to label if caption is not available. We should too.