fix(server): reduce SQLite "database busy" errors (#3760)

* fix(scanner): remove transactions where they are not strictly needed

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(server): force setStar transaction to start as IMMEDIATE

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(server): encapsulated way to upgrade tx to write mode

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(server): use tx immediate for some playlist endpoints

Signed-off-by: Deluan <deluan@navidrome.org>

* make more transactions immediate (#3759)

---------

Signed-off-by: Deluan <deluan@navidrome.org>
Co-authored-by: Kendall Garner <17521368+kgarner7@users.noreply.github.com>

server/nativeapi/playlists.go

@@ -100,7 +100,7 @@ func deleteFromPlaylist(ds model.DataStore) http.HandlerFunc {
 		p := req.Params(r)
 		playlistId, _ := p.String(":playlistId")
 		ids, _ := p.Strings("id")
-		err := ds.WithTx(func(tx model.DataStore) error {
+		err := ds.WithTxImmediate(func(tx model.DataStore) error {
 			tracksRepo := tx.Playlist(r.Context()).Tracks(playlistId, true)
 			return tracksRepo.Delete(ids...)
 		})