Remove unused feature flag.

Author: selanthiraiyan

Experiments/Experiments/FeatureFlag.swift

@@ -130,11 +130,6 @@ public enum FeatureFlag: Int {
     /// - Note: The app will ignore this if `performanceMonitoring` is `false`.
     case performanceMonitoringViewController
 
-    /// Temporary feature flag for the native Jetpack setup flow.
-    /// TODO-8075: replace this with A/B test.
-    ///
-    case nativeJetpackSetupFlow
-
     /// Temporary feature flag for the native Jetpack setup flow.
     ///
     case analyticsHub