Ensures usage service timeout is asserted

Changes the usage service test to explicitly assert that a timeout
exception is thrown when the countdown timer expires. This improves
the reliability and clarity of the test by ensuring that the expected
behavior is verified.

Author: niemyjski

tests/Exceptionless.Tests/Services/UsageServiceTests.cs

@@ -52,7 +52,7 @@ await messageBus.SubscribeAsync<PlanOverage>(po =>
 
         int totalToIncrement = eventsLeftInBucket - 1;
         await _usageService.IncrementTotalAsync(organization.Id, project.Id, totalToIncrement);
-        await countdown.WaitAsync(TimeSpan.FromMilliseconds(150));
+        await Assert.ThrowsAsync<TimeoutException>(async () => await countdown.WaitAsync(TimeSpan.FromMilliseconds(150)));
         Assert.Equal(2, countdown.CurrentCount);
 
         int eventsLeft = await _usageService.GetEventsLeftAsync(organization.Id);