Add logging relation to jupyter-ui charm

[rgildein]

Context

Add logging relation using loki_push_api interface and LogForwarder to jupyter-ui charm. Alternatively the LogProxyConsumer, could be used if the service is using log file instead of STDOUT, however this needs to be discussed because LogProxyConsumer is marked as deprecated.

This task is part of the COS integration initiative for all Kubeflow charms.

What needs to get done

1. Add logging relation using loki_push_api interface
2. Use LogForwarder or LogProxyConsumer
3. Use chisme abstraction for testing

Definition of Done

1. Charm could be related with grafana-agent-k8s via logging relation
2. This relation was tested by integration tests
3. This relation was tested manually with COS deployed

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5777.

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