Reviewed tag in seach work

Reviewed tag in seach work

- Refactored some tag code bits while reviewing.
- Updated tag design in search listing to be more subtle.
- Moved tags out of entity-list-item-basic template and instead moved
  them into entity-list-item, below the existing content.
- Tweaked existing tag colors a little.
- Changed tag icon to be more tag-like.
- Added tag-on-search test case.

Review of #2487, Related to #2462