Remove Event.wrapper for RecentSearches telemetry

[Alexandru2909]

Breakout form #21292.

┆Issue is synchronized with this Jira Task

[sflorean]

Verified as fixed on Nightly 4/18 with OnePlus 9 (Android 12).

  {
          "timestamp": 6901,
          "category": "recently_visited_homepage",
          "name": "history_highlight_opened"
        },
  {
          "timestamp": 9555,
          "category": "recent_tabs",
          "name": "show_all_clicked"
        },
 {  {
          "timestamp": 6901,
          "category": "recently_visited_homepage",
          "name": "history_highlight_opened"
        },
  {
          "timestamp": 9555,
          "category": "recent_tabs",
          "name": "show_all_clicked"
        },
 {
          "timestamp": 22771,
          "category": "recent_searches",
          "name": "group_deleted"
        }
          "timestamp": 22771,
          "category": "recent_searches",
          "name": "group_deleted"
        }