Review Mozilla 1910764: Update Google Play Services Ads Identifier to version 18.1.0

🔍 Bugzilla Audit

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1910764

Because of this Bug, I had to remove com.google.android.gms.permission.AD_ID from mobile/android/fenix/app/src/main/AndroidManifest.xml.

Let's check if it's been moved somewhere else instead.

It seems to me we're good (see 29974353), but a more in-depth investigation seems a good idea.

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