Add relation and expose metrics from jupyter-ui

[rgildein]

Context

Implement metrics-endpoint for the jupyter-ui, after #7633 is fixed in upstream and changes are included in release (e.g. 1.10).

We need to add relation using prometheus_scrape interface and grafana_dashboard interface if any dashboard is provided.

What needs to get done

1. Expose port for metrics as ServicePort
2. Implement metrics-endpoint endpoint
3. [Optional] Implement grafana-dashboard endpoint
4. [Optional] Find and add alert rules for metrics from upstream
5. [Optional] Find and add Grafana dashboards for metrics from upstream

Definition of Done

1. jupyter-ui has metrics-endpoint and grafana-dashboard endpoints
2. Integration with cos is tested

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-6108.

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