[PM-17562] Add support for retries on event integrations (#5795)

* [PM-17562] Add support for retires on event integrations

* Add additional test coverage

* Fixed missing await call

* Remove debug organization id

* Respond to PR feedback

* Change NotBeforeUtc to DelayUntilDate. Adjust comments.

* Respond to PR feedback

test/Core.Test/AdminConsole/Models/Data/Integrations/IntegrationMessageTests.cs

@@ -0,0 +1,53 @@
+using System.Text.Json;
+using Bit.Core.AdminConsole.Models.Data.Integrations;
+using Bit.Core.Enums;
+using Xunit;
+
+namespace Bit.Core.Test.Models.Data.Integrations;
+
+public class IntegrationMessageTests
+{
+    [Fact]
+    public void ApplyRetry_IncrementsRetryCountAndSetsDelayUntilDate()
+    {
+        var message = new IntegrationMessage<WebhookIntegrationConfigurationDetails>
+        {
+            RetryCount = 2,
+            DelayUntilDate = null
+        };
+
+        var baseline = DateTime.UtcNow;
+        message.ApplyRetry(baseline);
+
+        Assert.Equal(3, message.RetryCount);
+        Assert.True(message.DelayUntilDate > baseline);
+    }
+
+    [Fact]
+    public void FromToJson_SerializesCorrectly()
+    {
+        var message = new IntegrationMessage<WebhookIntegrationConfigurationDetails>
+        {
+            Configuration = new WebhookIntegrationConfigurationDetails("https://localhost"),
+            RenderedTemplate = "This is the message",
+            IntegrationType = IntegrationType.Webhook,
+            RetryCount = 2,
+            DelayUntilDate = null
+        };
+
+        var json = message.ToJson();
+        var result = IntegrationMessage<WebhookIntegrationConfigurationDetails>.FromJson(json);
+
+        Assert.Equal(message.Configuration, result.Configuration);
+        Assert.Equal(message.RenderedTemplate, result.RenderedTemplate);
+        Assert.Equal(message.IntegrationType, result.IntegrationType);
+        Assert.Equal(message.RetryCount, result.RetryCount);
+    }
+
+    [Fact]
+    public void FromJson_InvalidJson_ThrowsJsonException()
+    {
+        var json = "{ Invalid JSON";
+        Assert.Throws<JsonException>(() => IntegrationMessage<WebhookIntegrationConfigurationDetails>.FromJson(json));
+    }
+}