[fenix] For https://github.com/mozilla-mobile/fenix/issues/15366: Add recently closed tabs metrics.

app/src/main/java/org/mozilla/fenix/components/metrics/Event.kt

@@ -187,6 +187,8 @@ sealed class Event {
 
     object TabSettingsOpened : Event()
 
+    object RecentlyClosedTabsOpened : Event()
+
     // Interaction events with extras
 
     data class TopSiteSwipeCarousel(val page: Int) : Event() {

app/src/main/java/org/mozilla/fenix/components/metrics/GleanMetricsService.kt

@@ -674,6 +674,10 @@ private val Event.wrapper: EventWrapper<*>?
             { ProgressiveWebApp.backgroundKeys.valueOf(it) }
         )
 
+        is Event.RecentlyClosedTabsOpened -> EventWrapper<NoExtraKeys>(
+            { Events.recentlyClosedTabsOpened.record(it) }
+        )
+
         Event.MasterPasswordMigrationDisplayed -> EventWrapper<NoExtraKeys>(
             { MasterPassword.displayed.record(it) }
         )

app/src/main/java/org/mozilla/fenix/tabtray/TabTrayController.kt

@@ -250,6 +250,7 @@ class DefaultTabTrayController(
     override fun handleRecentlyClosedClicked() {
         val directions = TabTrayDialogFragmentDirections.actionGlobalRecentlyClosed()
         navController.navigate(directions)
+        metrics.track(Event.RecentlyClosedTabsOpened)
     }
 
     override fun handleGoToTabsSettingClicked() {