[APM] Set up routing for Services and Traces views

[formgeist]

Since we're adding a new Traces view, we want to be able to route directly to the Traces view i.e. from InfraOps UI. Currently there's no routing in place to handle going to either Services or Traces.

Services: /app/apm/services
Traces: /app/apm/traces

[elasticmachine]

Pinging @elastic/apm-ui

[sorenlouv]

@jasonrhodes Is this something you can take a stab at?

[jasonrhodes]

Sure! @formgeist for these pages, do we want to just duplicate the existing homepage but without the tabs for now? (i.e. services is just the content from the homepage services tab, traces just the content from the homepage traces tab)

[jasonrhodes]

@formgeist and I discussed in Zoom:

• The new routes will point to the existing APM homepage but with the "services" or "traces" tab active
• Clicking on the tabs will update the route
• The APM homepage will redirect to /services for now

[sorenlouv]

Deferred to 6.6