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.

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