[APM] Add beta badges to Service maps feature

[formgeist]

Summary

We want to add a beta badge to the Service maps feature in order to realistically meet users' expectations and if they encounter bugs they're welcome to report them to us before it goes generally available.

Solution

• Add beta badge to the map controls area of the map

• Exchange the EuiEmptyPrompt with a new EuiPanel with the betabadge enabled.
  

• Both badges will have the following copy;
  Title: Beta
  Description: This feature is currently in beta. If you encounter any bugs or have feedback, please open an issue or visit our discussion forum.

[elasticmachine]

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

[cauemarcondes]

I've refactored the Service map license prompt, I extracted it to a shared component. 1cfd8bed

[formgeist]

@cauemarcondes Awesome, wanted to check whether you were using EuiEmptyPrompt in this component, but seeing as it's just a regular EuiPanel you should be able to simply specify betaBadgeLabel={Beta} on it to get it to look like the design above.