Remove wrapper for Tabs Tray telemetry

[mcarare]

Breakout from #21292.

┆Issue is synchronized with this Jira Task

[LaurentiuApahideanSV]

I tested the issue on Firefox Nightly 2020-30-03 by testing the following tabs tray interaction and inactive tabs interactions:
Tabs tray interactions and the events these interaction ganerate:

Opening the tray
{
"timestamp": 8699,
"category": "tabs_tray",
"name": "opened"
},

Opening an existing tab
{
"timestamp": 27583,
"category": "tabs_tray",
"name": "opened_existing_tab",
"extra": {
"source": "Tabs tray"
}

Closing an existing tab
{
"timestamp": 5937,
"category": "tabs_tray",
"name": "closed_existing_tab",
"extra": {
"source": "Tabs tray"
}

Switching to private browsing
{
"timestamp": 31416,
"category": "tabs_tray",
"name": "private_mode_tapped"
},

Switching to normal browsing
{
"timestamp": 32539,
"category": "tabs_tray",
"name": "normal_mode_tapped"
},

New tab button pressed
{
"timestamp": 33467,
"category": "tabs_tray",
"name": "new_tab_tapped"
},

New private tab button pressed
{
"timestamp": 9032,
"category": "tabs_tray",
"name": "new_private_tab_tapped"
},
3 dot menu opened
{
"timestamp": 3273,
"category": "tabs_tray",
"name": "menu_opened"
},

Bookmark sites from tab tray
{
"timestamp": 43421,
"category": "tabs_tray",
"name": "bookmark_selected_tabs",
"extra": {
"tab_count": "2"
}

Tab tray dismissed (by swiping down)

save to collection
{
"timestamp": 21403,
"category": "tabs_tray",
"name": "save_to_collection"
},
share all tabs
{
"timestamp": 13316,
"category": "tabs_tray",
"name": "share_all_tabs"
}
close all tabs
{
"timestamp": 6853,
"category": "tabs_tray",
"name": "close_all_tabs"
},

Inactive tabs

Whether the inactive tab section is showing & the count of inactive tabs
{
"timestamp": 284,
"category": "tabs_tray",
"name": "has_inactive_tabs",
"extra": {
"inactive_tabs_count": "5"
}

Expand / collapse the inactive tabs
{
"timestamp": 4802,
"category": "tabs_tray",
"name": "inactive_tabs_expanded"
}

    {
      "timestamp": 7165,
      "category": "tabs_tray",
      "name": "inactive_tabs_collapsed"
    },

Opening an inactive tab:
{
"timestamp": 5108,
"category": "tabs_tray",
"name": "opened_existing_tab",
"extra": {
"source": "Inactive tabs"
}
Deleting/closing a single inactive tab
{
"timestamp": 9416,
"category": "tabs_tray",
"name": "closed_existing_tab",
"extra": {
"source": "Inactive tabs"
}

Deleting/closing all inactive tabs
{
"timestamp": 21987,
"category": "tabs_tray",
"name": "close_all_inactive_tabs"
}

Device used:

• OnePlus 6T (Android 9)

[mcarare]

Closing as verified per the above comment.