Bug 964776 - [Flatfish][Settings] No vibrating alert motor, "Vibrate" option should be removed from Settings

* Rename customization/sensors.json to customization/device-features.json
* Modify build.js to replace sensors.json with device-features.json
* Show/Hide 'Vibrate' checkbox according to the 'vibration' value in device-features.json
* Update .gitignore and integration test
Merge pull request #22861 from begeeben/964776_no_vibrating

Bug 964776 - [Flatfish][Settings] No vibrating alert motor, "Vibrate" option should be removed from Settings, r= Arthur Chen [:arthurcc]

* Rename customization/sensors.json to customization/device-features.json
* Modify build.js to replace sensors.json with device-features.json
* Show/Hide 'Vibrate' checkbox according to the 'vibration' value in device-features.json
* Update .gitignore and integration test