Refactor constant references across multiple files

Updated import statements and changed references from
`Domain.Constants` to `Value` in `APIEnvelopeJob.vb`,
`FinalizeDocumentJob.vb`, `HistoryModel.vb`, `EmailService.vb`,
and job scheduling files. This standardizes constant access
and improves code maintainability and readability.

EnvelopeGenerator.Service/Scheduler_Envelopetask_API.vb

@@ -28,8 +28,8 @@ Public Class Scheduler_Envelopetask_API
             BuildScheduler()
             Dim oJobKey = New JobKey(JobName)
             Dim oJobData = New JobDataMap() From {
-                {Domain.Constants.LOGCONFIG, LogConfig},
-                {Domain.Constants.DATABASE, ConnectionString}
+                {Value.LOGCONFIG, LogConfig},
+                {Value.DATABASE, ConnectionString}
             }
 
             Logger.Debug("Initialized Job [{0}]", JobName)