Refactored DocSignedNotificationTests to use typed repository
retrieval and explicit service resolution for PsPdfKitAnnotation.
Added a Services property to TestBase for easier access to
IServiceProvider. These changes improve clarity and robustness
of test dependency management.
Refactored Fake.cs to configure both in-memory and SQL Server
database contexts for testing, using the "Default" connection
string from configuration. Added detailed EF logging and SQL
executor setup. In TestBase.cs, fixed Setup to use the correct
repository instance for seeding email templates.
Changed test file namespaces from EnvelopeGenerator.Tests.Application to EnvelopeGenerator.Tests for consistency. Updated DigitalData.Core.Abstraction.Application package from 1.4.0 to 1.6.0 to incorporate latest improvements.
