Replaced `DigitalData.MessagingService.Client.DependencyInjection`
namespace with `DigitalData.MessagingService.Client` across the
codebase to simplify and streamline the project structure.
Removed unused `Microsoft.Extensions.Logging` and `System`
dependencies from `EmailSender.cs`. Updated project references
in `DigitalData.MessagingService.Tests.csproj` to reflect the
namespace and project restructuring. Adjusted `using` directives
in test files to align with the new namespace.
TekH
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