[fenix] For https://github.com/mozilla-mobile/fenix/issues/24576 - Record delete collection metric

app/src/main/java/org/mozilla/fenix/home/sessioncontrol/SessionControlController.kt

@@ -310,6 +310,7 @@ class DefaultSessionControlController(
 
     override fun handleDeleteCollectionTapped(collection: TabCollection) {
         removeCollectionWithUndo(collection)
+        Collections.removed.record(NoExtras())
     }
 
     override fun handleOpenInPrivateTabClicked(topSite: TopSite) {

app/src/test/java/org/mozilla/fenix/home/DefaultSessionControlControllerTest.kt

@@ -402,6 +402,10 @@ class DefaultSessionControlControllerTest {
         ).handleDeleteCollectionTapped(expectedCollection)
 
         assertEquals(expectedCollection, actualCollection)
+        assertTrue(Collections.removed.testHasValue())
+        val recordedEvents = Collections.removed.testGetValue()
+        assertEquals(1, recordedEvents.size)
+        assertEquals(null, recordedEvents.single().extra)
     }
 
     @Test