[BUG] Fix SQLite dependency in PersistenceFeatureBase

[Copilot]

Problem

When using a custom persistence feature with SQL Server, the following error occurs:

Services for database providers 'Microsoft.EntityFrameworkCore.SqlServer', 'Microsoft.EntityFrameworkCore.Sqlite' have been registered in the service provider. Only a single database provider can be registered in a service provider.

This happens because the SQLite provider's SetupForSqlite handler is unconditionally registered in the service collection even when using a different database provider, causing conflicts with other database providers like SQL Server.

Solution

The fix changes how the SQLite-specific handler registration is managed:

1. Removed the unconditional registration of SetupForSqlite handler from the UseSqlite extension method
2. Added a static helper method to SetupForSqlite class to register the handler in a more controlled way
3. Updated the SQLite extension method to use this new helper method
4. Added comments to clarify the purpose of these changes

Now when using SQL Server without SQLite, the SQLite-specific handler won't be automatically registered, preventing the provider conflict.

Notes

• The SetupForSqlite handler itself already had appropriate checks to only execute SQLite-specific code when the database is actually SQLite
• The issue was with its registration, not its implementation
• Other database providers like SQL Server didn't have this issue because they don't register similar handlers unconditionally

Fixes #49.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• crl3.digicert.com
  • Triggering command: /usr/lib/dotnet/dotnet exec /usr/lib/dotnet/sdk/8.0.115/NuGet.CommandLine.XPlat.dll package add --package Microsoft.EntityFrameworkCore --project /tmp/test-elsa/test-elsa.csproj --version 8.0.0 --dg-file /tmp/tmpcLUqBs.tmp (dns block)
• ocsp.digicert.com
  • Triggering command: /usr/lib/dotnet/dotnet exec /usr/lib/dotnet/sdk/8.0.115/NuGet.CommandLine.XPlat.dll package add --package Microsoft.EntityFrameworkCore --project /tmp/test-elsa/test-elsa.csproj --version 8.0.0 --dg-file /tmp/tmpcLUqBs.tmp (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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