Don't disable any versioned features when loading

[brennie]

Feature disabling was originally implemented as a hack so that we would limit the visible features to those that are currently in the most recent manifest. However, that runs into the issue where a feature is removed in nightly but we still want to experiment on the feature in release. In this scenario, we would have disabled the feature once it disappeared from the nightly manifest so you would not be able to configure such an experiment. We should no longer disable versioned features to avoid this.

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