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Also 40070: Consider storing the list of recommended addons

This implements our own AddonsProvider, which loads the list of
available addons from assets instead of fetching it from an
endpoint. In this list, we replace https-everywhere by
our https-everywhere-eff, so that the EFF one is shown as installed
in the addons list and the AMO one is not displayed.

Also, we hide the uninstall button for builtin addons.

We make sure our MOZ_BUILD_DATE gets used as a source for showing date
related information on the Fenix about page.

At the same time we adapt MOZ_BUILD_DATE to our needs where it is
actually used and not in tor-browser-build. This gives us more
flexibility. See: tor-browser-build#40084.

With the corresponding android-components patch, this allows all `startActivity`
that may open external apps to be replaced by `TorUtils.startActivityPrompt`.