V13: Refactor webhookservice to attempt pattern

[Zeegaan]

Notes

Notifications was introduced in #15174, and with it came cancelling by notification 👀
This meant that you could cancel Save/Delete operations, but the frontend did not match!
For example, if you canceled deleting a webhook, the controllers would return 200 OK, and thus the frontend would think that you had deleted the entity and thus remove it from your screen. It would only come back after a refresh.

This PR remedies that by implementing the attempt pattern also seen in v14, and with the OperationStatus, now returns the correct status codes & notifications 🚀

How to test

• Implement WebhookNotificationsComposer
• Run umbraco
• Create a webhook (Url and events are up to you)
• Try to delete it
• Assert that you get errors and are not moved from the "Are you sure you want to delete" prompt.

This should also be tested with creating / updating, this can be done by moving around the notification.CancelOperation(new EventMessage("", "")); in the WebhookNotificationsComposer .

WebhookNotificationsComposer

using Umbraco.Cms.Core.Composing;
using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.Models;
using Umbraco.Cms.Core.Notifications;

namespace Umbraco.Cms.Web.UI;

public class WebhookNotificationsComposer : IComposer
{
    public void Compose(IUmbracoBuilder builder)
    {
        builder.AddNotificationHandler<WebhookSavingNotification, WebhookNotificationHandler>();
        builder.AddNotificationHandler<WebhookSavedNotification, WebhookNotificationHandler>();
        builder.AddNotificationHandler<WebhookDeletingNotification, WebhookNotificationHandler>();
        builder.AddNotificationHandler<WebhookDeletedNotification, WebhookNotificationHandler>();
    }
}

public class WebhookNotificationHandler :
    INotificationHandler<WebhookSavingNotification>,
    INotificationHandler<WebhookSavedNotification>,
    INotificationHandler<WebhookDeletingNotification>,
    INotificationHandler<WebhookDeletedNotification>
{
    private readonly ILogger<WebhookNotificationHandler> _logger;

    public WebhookNotificationHandler(ILogger<WebhookNotificationHandler> logger) => _logger = logger;

    public void Handle(WebhookSavingNotification notification)
    {
        foreach (Webhook savedEntity in notification.SavedEntities)
        {
            _logger.LogInformation($"Saving webhook: {savedEntity.Url}");
        }
    }

    public void Handle(WebhookSavedNotification notification)
    {
        foreach (Webhook savedEntity in notification.SavedEntities)
        {
            _logger.LogInformation($"Saved webhook: {savedEntity.Url}");
        }
    }

    public void Handle(WebhookDeletingNotification notification)
    {
        notification.CancelOperation(new EventMessage("", ""));
        foreach (Webhook savedEntity in notification.DeletedEntities)
        {
            _logger.LogInformation($"Deleting webhook: {savedEntity.Url}");
        }
    }

    public void Handle(WebhookDeletedNotification notification)
    {
        foreach (Webhook savedEntity in notification.DeletedEntities)
        {
            _logger.LogInformation($"Deleted webhook: {savedEntity.Url}");
        }
    }
}

[elit0451]

Looks great 💪 💪 Merging