Removed ORM level delete cascades and replaced them by database cascades
PIM-1439 : Prepare UI to add audit datagrid
PIM-1439 : Define route and create datagrid in controller
PIM-1439 : Get datagrid view for channel controller to view
PIM-1439 : Add channel history datagrid to edit view
PIM-1439 : Fix error during channel update
PIM-1439 : Do some clean up
PIM-1439 : Add channel normalizers
PIM-1439 : Define normalizers as services
PIM-1439 : Fix UT using channel without category
PIM-1439 : Redefine methods from channel normalizer to flat normalizer
PIM-1439 : Fix error rendering channel history datagrid
PIM-1439 : Fix PHPCS on ChannelNormalizer
PIM-1439 : Display history datagrid only when editing a channel
PIM-1439 : Add UT for ChannelNormalizer
PIM-1439 : Create UT for channel normalizer
PIM-1439 : Add UT for FlatChannelNormalizer
PIM-1439 : UT refactoring creating NormalizerTestCase
Added custom entities support to completeness calculator
PIM-1439 : clean UT and Base class for normalizer UT