Re-design awarding emoji UI

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Problem

• Awarding emoji for a comment is not intuitive. It is in the top right corner. Is there a better design? In Facebook, the call to action is right below the comment. In Slack, when you mouseover the message, there is a popup with UI.
• Currently, clicking the existing the UI takes a few seconds the first time (at least on gitlab.com), before there's a popup with emoji to select from. This needs performance improvements.
• Which should be fixed first? If we re-design and re-implement the the awarding emoji UI, will the performance problems go away?

Related issues

https://gitlab.com/gitlab-org/gitlab-ce/issues/26371, https://gitlab.com/gitlab-org/gitlab-ce/issues/22474, https://gitlab.com/gitlab-org/gitlab-ce/issues/27977