Extract admin and results workflows into services

Program.cs

@@ -36,6 +36,8 @@ var connectionString = connectionBuilder.ToString();
 builder.Services.AddDbContext<AppDbContext>(options => options.UseSqlite(connectionString));
 builder.Services.AddScoped<SuggestionWorkflowService>();
 builder.Services.AddScoped<VoteWorkflowService>();
+builder.Services.AddScoped<AdminWorkflowService>();
+builder.Services.AddScoped<ResultsWorkflowService>();
 
 builder.Services.ConfigureHttpJsonOptions(options => { options.SerializerOptions.Converters.Add(new JsonStringEnumConverter()); });