ui: Slightly refactor %composite-rows and reuse ConsulServiceList component (#7886)

* ui: Move individual component types into a single %composite-list plus

1. Removes all out separate CSS components (that match HTML components)
to favour not having those separate for the moemnt at least
2. Reuses <ConsulServiceList /> component for Terminating Gateways >
Linked Services

* ui: Tweak breadcrumb spacing for '/' separator

* Fix up the tests i.e. services per tab so we can call them all services

ui-v2/app/styles/components/composite-row.scss

@@ -22,7 +22,7 @@
   // In this case we do not need a background on the icon
   background-color: $transparent !important;
 }
-.proxy-upstreams > ul,
-.proxy-exposed-paths > ul {
+.proxy-exposed-paths > ul,
+.proxy-upstreams > ul {
   border-top: 1px solid $gray-200;
 }