[traefik-route] There's no "route departed/broken" for TraefikRouteRequirer

[mmkay]

Bug Description

Although TraefikRouteProvider has a data_removed event: https://github.com/canonical/traefik-k8s-operator/blob/main/lib/charms/traefik_route_k8s/v0/traefik_route.py#L126

TraefikRouteRequirer only declares a ready event: https://github.com/canonical/traefik-k8s-operator/blob/main/lib/charms/traefik_route_k8s/v0/traefik_route.py#L119

That causes charms that use traefik_route not to handle ingress removed/broken/lost events (example)

To Reproduce

.

Environment

Should be the same for all environments.

Relevant log output

.

Additional context

No response

[mmkay]

We could have a broken event that could make the API consistent.