[APM] Expose K8s meta data in the service overview page

[dannycroft]

After a positive feedback round with https://github.com/elastic/kibana/issues/130117 we'd like to develop the PoC further. We'd like to implement the feedback that we've collected and release the changes in v8.5.0 under GA.

Enhancements

• [ ] Disable "Filter by value" for Kubernetes fields
• [ ] Remove some of the fields/labels under "Container"
• [ ] Check whether 'total no. of instances' in the flyout refers to the sum of active containers running the service
• [ ] Check whether 'container image field' in the flyout provides any actionable info.
• [ ] Improve UI by organising K8s info. as a hierarchical list (nice-to-have)
• [ ] Provide links to the Infra. metrics page(s) from the service overview page

Links

• Pitch (Internal)
• PoC PR
• Feedback Collection (Internal)

[elasticmachine]

Pinging @elastic/apm-ui (Team:apm)