Revamp the search results page

Description

The image below is the current search results page.

This screen needs to be reworked.

Proposal

• Display the information we usually get in the list of issues view:
  • Date created, updated
  • Number of comments
  • Author
• Highlight the search term
• Better display of the Closed state

Links / references

• Search term highlighted in the project search result page (https://gitlab.com/gitlab-org/gitlab-ce/issues/21724)

cc @dimitrieh @jschatz1 @JobV