In bug 1811947, we're introducing a warning for the declarativeNetRequestFeedback permission.
This is in addition to the permission warning for "declarativeNetRequest", introduced at bug 1780747 (https://github.com/mozilla-mobile/android-components/issues/12616).

Currently, Android's extension permission warnings are taken from the application instead of Gecko/GeckoView (bug 1671453), so we need a separate change to have the desired permission warning on Android.

Note that the declarativeNetRequest API is currently disabled by default, so we are not concerned with the timing of landing the permission string.
( If the feature were to be enabled by default, then the change on Android has to land before the change in Gecko/GeckoView, or else Nightly users could encounter an error or even crash when they try to install an extension with this permission. )

Landed on main https://github.com/mozilla-mobile/firefox-android/pull/743