pdm: Remove old converted inventory report

As a follow up of !1158 , now that stock browser supports inventory conversion, the old converted inventory report is not longer needed.

The reason for removing instead of fixing is that this report was using approaches that have no equivalent in ERP5JS interface (select in the module and run a report based on selection, listbox domain tree), so we could repair it for old ui only, but we thought it would be better to remove it and improve stock browser further.

One reason this was broken is that it was using `SimulationTool.getAllInventory` which does not support brain attributes from `SimulationTool.getInventoryList`, so dynamic attributes like `node_title` were not displayed correctly. This adds a warning on `getAllInventory` docstring. This method has another user so we don't remove it.

See merge request !1162