Runner type CSS cleanup

This change removes unused CSS to display the runner type as blue or
green. This was replaced by info/success badges respectively.

app/assets/stylesheets/_page_specific_files.scss

@@ -26,7 +26,6 @@
 @import './pages/projects';
 @import './pages/prometheus';
 @import './pages/registry';
-@import './pages/runners';
 @import './pages/search';
 @import './pages/service_desk';
 @import './pages/settings';

app/assets/stylesheets/pages/runners.scss

-.runner-state {
-  padding: 6px 12px;
-  margin-right: 10px;
-  color: $white;
-
-  &.runner-state-shared {
-    background: $green-400;
-  }
-
-  &.runner-state-specific {
-    background: $blue-400;
-  }
-}