scripts: remove board name from the qualifiers in list_boards.py
Fixes: #69329
The board name was printed as part of printing board qualifiers because
those was being concatenated in the `board_v2_qualifiers()` method.
Keep the qualifiers separated from the board name and let the caller
concatenate the strings when required.
Completion scripts are also updated to handle the corrected behaviour.
Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
(cherry picked from commit 66b475a3aa4d73f4ddd5be5a7a1e0f3c7028e539)
6 files changed
