Update add video to playlist prompt to show presence count when adding 2+ videos#4818

PikachuEXE wants to merge 2 commits intoFreeTubeApp:developmentFreeTubeApp/FreeTube:developmentfrom

PikachuEXE:feature/playlist/video-in-playlist-count-multiPikachuEXE/FreeTube:feature/playlist/video-in-playlist-count-multiCopy head branch name to clipboard