BT : Fix template_keep_path_list for CatalogMethodTemplateItem
For years, erp5_calendar was keeping a duplicated copy of z_catalog_stock_list. In a79ca4c1, the functionality was merged in erp5_mysql_innodb and the duplicated copy was removed from erp5_calendar.
Problem is that when we update erp5_calendar, z_catalog_stock_list is removed.
We discussed in https://lab.nexedi.com/nexedi/erp5/commit/a79ca4c17c644018956a34d4a7bdd3caf2a6c9a5#note_15577 and suggested to use Path of objects that should be kept like we already did in some other business templates.
I tried, but it did not work, because CatalogMethod.preinstall overwrites the returned value of ObjectTemplateItem.preinstall (which supports template_keep_path_list) with the returned value of BaseTemplateItem.preinstall which does not support it.
My understanding is that the former is necessary to install the z sql methods and later to install the configuration on the catalog
( see efe5294e ), but the order does not really mater, so it's safe to give priority to ObjectTemplateItem.preinstall.
I also add some tests for template_keep_path_list, I think it was not tested, and modified erp5_calendar as suggested.