[WIP] PIM-2368: Move mass action from product repository to another class

| Q                   | A
| ------------------- | ---
| Bug fix?            | N
| New feature?        | N
| BC breaks?          | Y
| Tests pass?         |
| Scenarios pass?     |
| Checkstyle issues?  |
| Changelog updated?  |
| Fixed tickets       | PIM-2368
| Doc PR              |