Support for space-separated lists was deprecated a long time ago
a91620f5bb so it is time to remove
support for them.
Any project that has not migrated can still use
`scripts/utils/twister_to_list.py` to automatically migrate twister
files.
Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
Space separated lists are deprecated but this notice is not checked for.
extract_fields_from_arg_list also converts lists back to space-separated
lists causing a warning on get_scenario
Signed-off-by: Wilfried Chauveau <wilfried.chauveau@arm.com>