3bd09d7884
- Add `preonboarding` Nimbus feature for showing a window modal over about:welcome that cannot be dismissed via ESC - Include the ability to suppress showing the privacy notice tab on first run using a variable under the new `preonboarding` feature - Remove legacy `showModal` related `aboutwelcome` Nimbus feature variables (these are not in use and were for [[ https://experimenter.services.mozilla.com/nimbus/window-modal-vs-tab-modal/summary | an old experiment ]]) Differential Revision: https://phabricator.services.mozilla.com/D234039
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