In #26594 a need arose for a stylised "beta" token that would be applied to the Site Editor menu item in the wp-admin navigation.

This affordance may also be useful on a per-block level in the Site Editor as it becomes more prominent over time, to remind folks that many features are still a work in progress.

We can apply a similar style treatment to the Site Editor link in the wp-admin navigation for consistency, if there is perceived value in doing so:

Taking one step back, this feature may also be handy in the future for communicating other at-a-glance block information such as newness, secondary grouping (e.g. to indicate which blocks were added by a specific plugin), or whether an upgrade is required (for blocks with premium features).