Bug 1945545 - Add nimbus flag for enabling Merino integration r=android-reviewers,Roger

Differential Revision: https://phabricator.services.mozilla.com/D236561

Author: gabrielluong

mobile/android/fenix/app/nimbus.fml.yaml

@@ -547,6 +547,15 @@ features:
         type: Boolean
         default: false
 
+  merino-recommendations:
+    description: Sets the recommendations provider service to Merino.
+    variables:
+      enabled:
+        description: >
+          Whether or not to enable Merino endpoint to serve recommendations.
+        type: Boolean
+        default: false
+
   microsurveys:
     description: Feature for microsurveys.
     variables:

mobile/android/fenix/app/src/main/java/org/mozilla/fenix/FeatureFlags.kt

@@ -78,11 +78,6 @@ object FeatureFlags {
      */
     const val HOMEPAGE_AS_NEW_TAB = false
 
-    /**
-     * Enables Merino content recommendations.
-     */
-    const val MERINO_CONTENT_RECOMMENDATIONS = false
-
     /**
      * Enables the Unified Trust Panel.
      */

mobile/android/fenix/app/src/main/java/org/mozilla/fenix/utils/Settings.kt

@@ -1686,9 +1686,10 @@ class Settings(private val appContext: Context) : PreferencesHolder {
     /**
      * Indicates if Merino content recommendations should be shown.
      */
-    var showContentRecommendations by booleanPreference(
+    var showContentRecommendations by lazyFeatureFlagPreference(
         key = appContext.getPreferenceKey(R.string.pref_key_pocket_content_recommendations),
-        default = FeatureFlags.MERINO_CONTENT_RECOMMENDATIONS,
+        default = { FxNimbus.features.merinoRecommendations.value().enabled },
+        featureFlag = true,
     )
 
     /**