Start logging the hashed FxA uid exposed by the logins API with our telemetry

[irrationalagent]

Since this pr was merged in A-S, both the android and iOS apps should be able to pull the hashed FxA uid from the rust logins api.

for the iOS app, we already send the unhashed version of the id, in the extra field. if we can start pulling the hashed version from the logins api and start sending that instead, then we would be able to join telemetry from the existing desktop manager to the event telemetry emitted by the iOS app, allowing us to understand how the same lockwise user interacts with both the desktop browser's pw manager and lockwise, e.g. are lockwise users more willing to manage their credentials than non-lockwise users, etc.

depends on mozilla/application-services#1154 similar android issue

[irrationalagent]

this is blocked by this now https://github.com/mozilla/application-services/issues/1154

[linuxwolf]

cc @georgf @irrationalagent

In case this iOS variant has similar considerations as mozilla-lockbox/lockbox-android#645

[georgf]

Glean currently doesn't support iOS yet (we're targeting end of Q3 for that), so this shouldn't have Glean considerations.