Enable the media browser feature 🖼️ (#3642)

* Overlay a progress indicator for downloads instead of using a toast indicator.

* Update the SDK.

* Remove the feature flag for the media browser.

* Remove the media captions feature flag too.

* Add unit test cases for download failure and swiping between items.

* Snapshots (with the media browser visible in the screen).

ElementX/Sources/Application/AppSettings.swift

@@ -49,8 +49,6 @@ final class AppSettings {
         case fuzzyRoomListSearchEnabled
         case enableOnlySignedDeviceIsolationMode
         case knockingEnabled
-        case createMediaCaptionsEnabled
-        case mediaBrowserEnabled
         case eventCacheEnabled
     }
     
@@ -292,12 +290,6 @@ final class AppSettings {
     @UserPreference(key: UserDefaultsKeys.knockingEnabled, defaultValue: false, storageType: .userDefaults(store))
     var knockingEnabled
     
-    @UserPreference(key: UserDefaultsKeys.createMediaCaptionsEnabled, defaultValue: false, storageType: .userDefaults(store))
-    var createMediaCaptionsEnabled
-    
-    @UserPreference(key: UserDefaultsKeys.mediaBrowserEnabled, defaultValue: false, storageType: .userDefaults(store))
-    var mediaBrowserEnabled
-    
     #endif
     
     // MARK: - Shared