reset experiment (#3832)

Task/Issue URL:
https://app.asana.com/0/1204186595873227/1209311973888722

**Description**: Restart onboarding experiment with contextual
onboarding

Author: SabrinaTardio

DuckDuckGo/Statistics/Experiment/PixelExperiment.swift

@@ -60,8 +60,8 @@ enum PixelExperiment: String, CaseIterable {
 
     // These are the variants. Rename or add/remove them as needed.  If you change the string value
     //  remember to keep it clear for privacy triage.
-    case control = "oe"
-    case newOnboarding = "of"
+    case control = "og"
+    case newOnboarding = "oh"
 }
 
 // These functions contain the business logic for determining if the pixel should be fired or not.

DuckDuckGo/Tab/Model/Tab.swift

@@ -808,7 +808,12 @@ protocol NewWindowPolicyDecisionMaker {
             return
         }
 #endif
-        setContent(PixelExperiment.cohort == .newOnboarding ? .onboarding : .onboardingDeprecated)
+        if PixelExperiment.cohort == .newOnboarding {
+            Application.appDelegate.onboardingStateMachine.state = .notStarted
+            setContent(.onboarding)
+        } else {
+            setContent(.onboardingDeprecated)
+        }
     }
 
     @MainActor(unsafe)