scripts: twister: Solve deprecation notice when running tests

CONF_FILE, DTC_OVERLAY_FILE and OVERLAY_CONFIG are deprecated but still
used by the tests causing warnings when running them.

This adds a test_data specific to validate the emission of the warning,
and removes the offending args from the other test_data files.

Signed-off-by: Wilfried Chauveau <wilfried.chauveau@arm.com>