Update DbTriggerParams and EF Core package versions

- Changed DbTriggerParams to use ICollection<string> for flexibility.
- Updated Microsoft.EntityFrameworkCore.SqlServer to version 9.0.6.
- Made _logger in EGDbContext nullable and optional in constructor.
- Updated logging statements to prevent null reference exceptions.
- Added Microsoft.EntityFrameworkCore.SqlServer package for net8.0 and net9.0.
- Introduced appsettings.migration.json for connection strings and trigger parameters.
- Added EGDbContextFactory for design-time DbContext creation.

EnvelopeGenerator.Infrastructure/appsettings.migration.json

@@ -0,0 +1,13 @@
+{
+  "ConnectionStrings": {
+    "Default": "Server=SDD-VMP04-SQL17\\DD_DEVELOP01;Database=DD_ECM_DATA_MIGR_TEST;User Id=sa;Password=dd;Encrypt=false;TrustServerCertificate=True;"
+  },
+  "DbTriggerParams": {
+    "Envelope": [ "TBSIG_ENVELOPE_HISTORY_AFT_INS" ],
+    "EnvelopeHistory": [ "TBSIG_ENVELOPE_HISTORY_AFT_INS" ],
+    "EmailOut": [ "TBEMLP_EMAIL_OUT_AFT_INS", "TBEMLP_EMAIL_OUT_AFT_UPD" ],
+    "EnvelopeReceiverReadOnly": [ "TBSIG_ENVELOPE_RECEIVER_READ_ONLY_UPD" ],
+    "Receiver": [],
+    "EmailTemplate": [ "TBSIG_EMAIL_TEMPLATE_AFT_UPD" ]
+  }
+}