bugfix: twister: Fix interaction between quarantine integration mode

Tests under quarantine are not treated as errors in the integration
mode. However --quarantine-verify argument allowing to execute just
test under quarantine and skipping others was not considered in
relation to integration mode. Those skips are wrongly threated as
errors. This commit fix this relation and makes thoses skips not
turned to errors.

fixes: #54516

Signed-off-by: Maciej Perkowski <Maciej.Perkowski@nordicsemi.no>