Simplify usage of integration tests from nuget package

[bergmania]

This makes it simpler to use the integration test framework using nuget.

Now it is not required to add your own assembly to the list of assemblies to scan.

Test

• Tests should pass
• Use the nuget package (Umbraco.CMS.Tests.Integration) and setup a integration tests

    [TestFixture]
    [UmbracoTest(Database = UmbracoTestOptions.Database.NewSchemaPerTest)]
    public class TranslationsBuilderServiceTests : UmbracoIntegrationTest
    {
        [OneTimeSetUp]
        public void OneTimeSetUp()
        {
           // This is not required anymore with the new fix
           // TestOptionAttributeBase.ScanAssemblies.Add(this.GetType().Assembly);
        }

        [Test]
        public void Test()
        {
            // What ever
        }
    }

[Zeegaan]

Tested this and it also works by making a test class in the web project (not recommended of course) 👍

LGTM 💪