Remove Event.wrapper for autofill related telemetry

[mcarare]

Breakout from #21292.

┆Issue is synchronized with this Jira Task

[LaurentiuApahideanSV]

I tested the issue on Firefox Nightly 2022-04-19 by using it as an autofill application for other apps and observing the results.

When Fenix is successfully unlocked through the device security option.
{
"timestamp": 4361,
"category": "android_autofill",
"name": "unlock_successful"
}

When unlocking Fenix using the device security option is canceled.
{
"timestamp": 22,
"category": "android_autofill",
"name": "unlock_cancelled"
}

When the search option is used
{
"timestamp": 15615,
"category": "android_autofill",
"name": "search_displayed"
},

When a credential from the search list is selected
{
"timestamp": 12999,
"category": "android_autofill",
"name": "search_item_selected"
}

When the yes option is selected from the "Verification failed" warning message
{
"timestamp": 5121,
"category": "android_autofill",
"name": "confirm_successful"
}

When the no option is selected from the "Verification failed" warning message
{
"timestamp": 9434,
"category": "android_autofill",
"name": "confirm_cancelled"
}

When logins are successfully found
{
"timestamp": 0,
"category": "android_autofill",
"name": "request_matching_logins"
},

When suitable logins are not found
{
"timestamp": 6795,
"category": "android_autofill",
"name": "request_no_matching_logins"
},
Glean Dashboard

Device used:

• OnePlus 6T (Android 9)