Refactored multiple files to eliminate dependencies on the
EnvelopeGenerator.CommonServices namespace. This includes
removing using directives in `ReadEmailTemplateQueryHandler.cs`,
`ReadEnvelopeResponse.cs`, and `ReadHistoryResponse.cs`.
Additionally, project references to `EnvelopeGenerator.CommonServices.vbproj`
were removed from both `EnvelopeGenerator.Application.csproj` and
`EnvelopeGenerator.Extensions.csproj`, indicating a shift towards
using only the `EnvelopeGenerator.Domain` project.
TekH
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