OptimizedproductscountinginBOproductlist

| Questions | Answers
| ------------- | -------------------------------------------------------
| Branch? | develop
| Description? | When there's ~150000 or more products in PrestaShop you can't access product list in Back Office since it crashes due to insufficient SQL optimization. This PR fixes the issue.
| Type? | improvement
| Category? | CO
| BC breaks? | no
| Deprecations? | no
| Fixed ticket? | n/a
| How to test? | You must have ~100k or more (I had ~150k) products and try to access product list in Back Office.

该提问来源于开源项目：PrestaShop/PrestaShop