Update Respawn to Latest Version (6.2.1) with Breaking Changes Migration

[Copilot]

This PR updates the Respawn package from version 5.0.1 to the latest version 6.2.1 and addresses all breaking changes introduced in version 6.x.

Changes Made

Package Update

• Updated Respawn package reference from 5.0.1 to 6.2.1

API Migration in DatabaseFixture

The major breaking change in Respawn 6.x was the replacement of the Checkpoint class with the Respawner class and a new factory pattern:

Before (v5.x):

_checkpoint = new Checkpoint()
{
    TablesToIgnore = new Table[] { "__EFMigrationsHistory" },
    DbAdapter = DbAdapter.SqlServer
};

await _checkpoint.Reset(conn);

After (v6.x):

_respawner = await Respawner.CreateAsync(conn, new RespawnerOptions
{
    TablesToIgnore = new Table[] { "__EFMigrationsHistory" },
    DbAdapter = DbAdapter.SqlServer
});

await _respawner.ResetAsync(conn);

Implementation Details

• Lazy Initialization: Implemented lazy initialization pattern since the new Respawner.CreateAsync() factory method requires a database connection, which isn't available during constructor execution
• Configuration Migration: Moved from direct property assignment to RespawnerOptions configuration object
• Method Updates: Updated Reset() to ResetAsync() calls
• Backward Compatibility: Maintained the existing public API for consumers of this library by keeping the same constructor signature pattern

Validation

• ✅ Project builds successfully in both Debug and Release configurations
• ✅ All existing DatabaseFixture functionality preserved
• ✅ Helper methods (InsertAsync, FindAsync, etc.) continue to work correctly
• ✅ Created and ran comprehensive tests to validate the migration

The migration successfully addresses all breaking changes while maintaining backward compatibility for consumers of this utility library.

Fixes #18.

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