Non-TLS traffic through ingress shouldn't be allowed when TLS is enabled

[michaeldmitry]

Bug Description

Currently, when TLS is enabled, users can still hit the the ingress endpoint using http and Traefik charm would allow it.

To Reproduce

1. Deploy Traefik
2. Deploy any app (e.g: Tempo)
3. Integrate Traefik and Tempo over traefik_route
4. Deploy SSC
5. Integrate Traefik and SSC
6. Curl any valid Tempo endpoint using Traefik's ingress URL but use http://<endpoint> not https://<endpoint>

Environment

microk8s 1.28.13
juju 3.4.5

Relevant log output

N/A

Additional context

No response

[dstathis]

Let's see if this is for traefik route only or if it applies for all traffic relations. If it is for traefik route only, we should not fix it as this can be configured by the consumer. If this exists for other traefik relations, then we should automatically upgrade the connection.

[dstathis]

This will likely be handled by #430.