test(supplier): isolate subject_code test (DatabaseTransactions+SharesSupplierPdo)

app/tests/Feature/Supplier/SupplierProjectSubjectCodeTest.php

@@ -4,6 +4,10 @@ declare(strict_types=1);
 
 use App\Models\SupplierProject;
 use Illuminate\Database\QueryException;
+use Illuminate\Foundation\Testing\DatabaseTransactions;
+use Tests\Concerns\SharesSupplierPdo;
+
+uses(DatabaseTransactions::class, SharesSupplierPdo::class);
 
 it('allows same (platform, unique_key) with different subject_code', function (): void {
     SupplierProject::query()->create([