LAr bad channel data overlay overrides fixes

This MR fixes LAr bad channel data overlay overrides in master. Some folders now require underlaying class name to be passed which is then handled by the CondInputLoader. Fixes ATLASSIM-4849.

Some major changes have been needed for CondDB to properly handle blocking of folders with types in master so running with full-unit-tests.

/cc @jchapman @tkharlam @sroe