Add LINQ database query optimizations for large data scenarios

[Copilot]

LINQ Optimizations from PR #1302 - Rebased on Master ✅

This PR addresses database performance issues when working with workflows that have large amounts of related data. The implementation has been rebased onto the latest master branch.

Implementation Summary

✅ Core LINQ Changes Successfully Added:

1. LargeDataOptimizedEntityFrameworkPersistenceProvider.cs - New optimized persistence provider that uses Entity Framework Core's AsSplitQuery() method to prevent Cartesian explosion in complex queries
2. Entity Framework Version Upgrade - Updated netstandard2.1 target from EF Core 3.1.2 to 5.0.1 to support the AsSplitQuery() feature
3. Enhanced PostgreSQL Extensions - Added largeDataOptimized boolean parameter to UsePostgreSQL() method
4. Enhanced SQL Server Extensions - Added largeDataOptimized boolean parameter to UseSqlServer() method

❌ Excluded Changes (As Requested):

• All integration test generic parameter changes (<TSelf> additions)
• Formatting/whitespace changes
• Test collection name constant changes
• Duplicated test scenarios for optimization testing
• Any other non-LINQ related modifications from the original PR

✅ Latest Updates:

• Successfully rebased onto latest master branch (commit 76c011c)
• Full solution builds successfully after rebase
• All LINQ optimization changes preserved

Technical Details

Database Query Optimization: The new LargeDataOptimizedEntityFrameworkPersistenceProvider addresses the non-optimal database query issue (issue #1169) by using AsSplitQuery() in Entity Framework queries. This prevents the Cartesian product problem when loading workflows with many execution pointers and their related data.

Usage:

• PostgreSQL: options.UsePostgreSQL(connectionString, canCreateDB, canMigrateDB, largeDataOptimized: true)
• SQL Server: options.UseSqlServer(connectionString, canCreateDB, canMigrateDB, largeDataOptimized: true)

Files Changed:

• LargeDataOptimizedEntityFrameworkPersistenceProvider.cs (new file, 135 lines)
• WorkflowCore.Persistence.EntityFramework.csproj (EF version update)
• PostgreSQL ServiceCollectionExtensions.cs (added optimization option)
• SQL Server ServiceCollectionExtensions.cs (added optimization option)

This implementation provides the exact LINQ optimization benefits from PR #1302 while maintaining a minimal changeset focused purely on the database query performance improvements.

Original prompt

please recreate PR #1302 as a new PR, but without all the unnecessary changes. Only include the Linq changes, please exclude the changes to the integrations tests where generic parameters are being added. Also please leave out the formatting changes.

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[danielgerlag]

@copilot please rebase this PR from master

[Copilot]

@copilot please rebase this PR from master

Done! The PR has been successfully rebased onto the latest master branch (commit 76c011c). All LINQ optimization changes are preserved and the solution builds successfully. The rebased changes are now in commit b31d6b5.