[PM-23904] Add risk insights for premium feature flag (#6491)

Author: shane-melton

src/Core/Constants.cs

@@ -241,6 +241,7 @@ public static class FeatureFlagKeys
     public const string PM22134SdkCipherListView = "pm-22134-sdk-cipher-list-view";
     public const string PM19315EndUserActivationMvp = "pm-19315-end-user-activation-mvp";
     public const string PM22136_SdkCipherEncryption = "pm-22136-sdk-cipher-encryption";
+    public const string PM23904_RiskInsightsForPremium = "pm-23904-risk-insights-for-premium";
 
     /* Innovation Team */
     public const string ArchiveVaultItems = "pm-19148-innovation-archive";