Fix eager load relations with complex foreign/local keys

[max-kut]

🔗 Linked issue

#1799

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This fix resolves the issue of nested relationships loading incorrectly when the identifiers of both entities are complex.
e.g.

class LeadPointProduct extends Model {
  static entity = 'leads/point/products';
  static primaryKey = ['leadId', 'pointId', 'productId'];

  static fields() {
    return {
      leadId: this.attr(null),
      pointId: this.attr(null),
      productId: this.attr(null),
    };
  }

  declare leadId: number;
  declare pointId: number;
  declare productId: number;
}

class LeadPoint extends Model {
  static entity = 'leads/points';
  static primaryKey = ['leadId', 'pointId'];

  static fields() {
    return {
      leadId: this.attr(null),
      pointId: this.attr(null),
      // relations
      leadPointProducts: this.hasMany(
        LeadPointProduct,
        ['leadId', 'pointId'],
        ['leadId', 'pointId'],
      ).onDelete('cascade'),
    };
  }

  declare leadId: number;
  declare pointId: number;
  declare leadPointProducts: LeadPointProduct[];
}

class Lead extends Model {
 static entity = 'leads';

  static fields() {
    return {
      id: this.attr(null),
      // relations
      leadPoints: this.hasMany(LeadPoint, 'leadId').onDelete('cascade'),
    };
  }

  declare id: number;
  // relations
  declare leadPoints: LeadPoint[];
}

const lead = useRepo(Lead)
      .with('leadPoints', q => q .with('leadPointProducts'))
      .find(1);

Each leadPoints entity had the same array of leadPointProducts elements

This hotfix solves this problem

Reproduce

https://stackblitz.com/edit/pinia-orm-eager-load-bug?file=src%2FApp.vue

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[max-kut]

@CodeDredd please pay attention here. All ready for the patch

[CodeDredd]

I try to add an test. The one thing missing :) But good job 👍

[max-kut]

@CodeDredd Thank you