Add Multi-Tenant Role Validation and Index Modification for Unique Role Names per Tenant

[neozhu]

Branch Name

feature/multi-tenant-role-validation

Pull Request Description

This pull request introduces the following changes:

1. Custom Multi-Tenant Role Validator:

   • Added MultiTenantRoleValidator to enforce unique role names per tenant.
   • This ensures that role names cannot be duplicated within the same tenant, providing proper isolation in multi-tenant environments.

2. Replace Default Role Validator:

   • Registered MultiTenantRoleValidator in the service collection to replace the default RoleValidator<ApplicationRole>.
   • Removed the default role validator to ensure only the custom validation logic is applied.

3. Index Modification:

   • Modified the database index for the ApplicationRole entity to enforce a unique constraint on the combination of Name and TenantId.
   • This change ensures that the database enforces role uniqueness within each tenant, avoiding conflicts and duplications at the data layer.

These changes address the issue of role name collisions in multi-tenant scenarios and provide a consistent solution both at the application and database levels to maintain role uniqueness within each tenant.