Add action to select and start a provided beatmap

osu.Game/Screens/SelectV2/ISongSelect.cs

@@ -50,5 +50,10 @@ namespace osu.Game.Screens.SelectV2
         /// Present the provided score at the results screen.
         /// </summary>
         void PresentScore(ScoreInfo score);
+
+        /// <summary>
+        /// Selects the provided beatmap and progresses song select to the next screen.
+        /// </summary>
+        void SelectAndStart(BeatmapInfo beatmap);
     }
 }

osu.Game/Screens/SelectV2/SongSelect.cs

@@ -455,6 +455,15 @@ namespace osu.Game.Screens.SelectV2
             this.Push(new EditorLoader());
         }
 
+        /// <summary>
+        /// Finalises selection on the given <see cref="BeatmapInfo"/>.
+        /// </summary>
+        public void SelectAndStart(BeatmapInfo beatmap)
+        {
+            Beatmap.Value = beatmaps.GetWorkingBeatmap(beatmap);
+            OnStart();
+        }
+
         public void Delete(BeatmapSetInfo beatmapSet) => dialogOverlay?.Push(new BeatmapDeleteDialog(beatmapSet));
 
         public void ClearScores(BeatmapInfo beatmap) => dialogOverlay?.Push(new BeatmapClearScoresDialog(beatmap));