[APM][Services] Add log charts to APM service overview

[iblancof]

Describe the feature:

We want to make APM users aware that they could also have log data available.

Let's display the charts at the bottom of the overview page.

Implementation hints We will be removing the URL path /logs-services and instead managing the logic for services with only logs under a single view at /services.

To achieve this, we will use the endpoint /internal/apm/entities/services/{serviceName}/summary, which will indicate whether the service has signals or not. We will need to block (with the appropriate loading state) the loading of the overview until this request is completed, as the content displayed will depend on the response from this request.

[elasticmachine]

Pinging @elastic/obs-ux-infra_services-team (Team:obs-ux-infra_services)

[cauemarcondes]

Test this: https://github.com/elastic/kibana/issues/190437