We want to allow users to click on a media item in the gallery and navigate to either the `VideoPlaybackModal` or the `ImageModal`. The `key` parameter for the navigation is similar to the `getMediaKey` method (https://github.com/CommE2E/comm/blob/dc2f711faf30930a7c9f7f906a2a2b9f28d38bb0/native/chat/multimedia-message-utils.js#L129-L134). Here, for the thread media gallery, the key `multimedia|${threadID}|${mediaInfo.index}` is unique per media so when the key is pushed to the StackNavigator, there will be no existing duplicate key. We calculate the corners by checking the index of the
media item relative to the gallery and the length of `mediaInfos`.
https://linear.app/comm/issue/ENG-2990/navigate-to-the-image-video-modal-when-a-user-clicks-on-a-media-item