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/EnvelopeGenerator.Infrastructure.csproj

@@ -27,6 +27,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="7.0.20" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net8.0'">
@@ -36,6 +37,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.17" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net9.0'">
@@ -45,6 +47,13 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="9.0.6" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="appsettings.migration.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 
 </Project>