Remove Event.wrapper for Tabs telemetry

[Alexandru2909]

Breakout from #21292.

┆Issue is synchronized with this Jira Task

[sflorean]

Verified as fixed on Nightly 4/ 19 with OnePlus 9 (Android 12).

{
         "timestamp": 2028,
         "category": "start_on_home",
         "name": "open_tabs_tray"
       },
       {
         "timestamp": 2059,
         "category": "tabs_tray",
         "name": "opened"
       },
       {
         "timestamp": 2111,
         "category": "tabs_tray",
         "name": "has_inactive_tabs",
         "extra": {
           "inactive_tabs_count": "0"
         }
         "timestamp": 2112,
         "category": "search_terms",
         "name": "number_of_search_term_group",
         "extra": {
           "count": "1"
         }
         "timestamp": 2112,
         "category": "search_terms",
         "name": "average_tabs_per_group",
         "extra": {
           "count": "2.0"
       {
         "timestamp": 5625,
         "category": "tabs_tray",
         "name": "enter_multiselect_mode",
         "extra": {
           "tab_selected": "true"
         }
         "timestamp": 8680,
         "category": "tabs_tray",
         "name": "bookmark_selected_tabs",
         "extra": {
           "tab_count": "2"
       {
         "timestamp": 11495,
         "category": "tabs_tray",
         "name": "menu_opened"
       {
         "timestamp": 13499,
         "category": "tabs_tray",
         "name": "enter_multiselect_mode",
         "extra": {
           "tab_selected": "false"
       {
         "timestamp": 18377,
         "category": "tabs_tray",
         "name": "share_all_tabs"

         "timestamp": 24116,
2022-04-19 11:58:27.700 7511-7726/? I/libglean_ffi:       "category": "tabs_tray",
         "name": "menu_opened"
       },
         "timestamp": 32195,
         "category": "events",
         "name": "recently_closed_tabs_opened"
       {
         "timestamp": 38273,
         "category": "tabs_tray",
         "name": "close_all_tabs"
       {
         "timestamp": 66093,
         "category": "tabs_tray",
         "name": "private_mode_tapped"
       {
         "timestamp": 67259,
         "category": "tabs_tray",
         "name": "synced_mode_tapped"
       }