Enable the Optimised Media Uploads feature. (#3467)

* Enable the Optimised Media Uploads feature.

(Well move the toggle from Developer Options to Advanced Settings)

* Add OptimizeMediaUploads analytics.

* Final strings.

* Upload reduced quality media by default 😢

Move the setting out of the feature flags section in the file.

* Fix unit tests now the default has changed.

* Pull in updated string, fix snapshots.

UnitTests/Sources/MediaUploadingPreprocessorTests.swift

@@ -17,6 +17,7 @@ final class MediaUploadingPreprocessorTests: XCTestCase {
     override func setUp() {
         AppSettings.resetAllSettings()
         appSettings = AppSettings()
+        appSettings.optimizeMediaUploads = false
         ServiceLocator.shared.register(appSettings: appSettings)
         mediaUploadingPreprocessor = MediaUploadingPreprocessor(appSettings: appSettings)
     }