Refactored `DocSignedNotification` to remove inheritance from
`EnvelopeReceiverDto` and introduced a required `EnvelopeReceiver`
property. Updated all usages across the codebase to align with the
new structure, including controllers, handlers, and tests.
- Improved encapsulation and reduced coupling by making
dependencies explicit.
- Updated `AnnotationController`, `DocStatusHandler`,
`HistoryHandler`, and `SendSignedMailHandler` to use the
`EnvelopeReceiver` property.
- Adjusted `DocSignedNotificationTests` to reflect the new
instantiation pattern.
- Updated XML documentation and ensured consistent access to
`EnvelopeReceiver` properties like `EnvelopeId`, `ReceiverId`,
and `EmailAddress`.
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