CODEOWNERS: add owners for scripts/twister/extended

Initially ncs-low-level-test.

Signed-off-by: Piotr Kosycarz <piotr.kosycarz@nordicsemi.no>

Author: nordic-piks

CODEOWNERS

@@ -702,6 +702,9 @@
 /scripts/twister/alt/zephyr/samples/basic/ @nrfconnect/ncs-ll-ursus
 /scripts/twister/alt/zephyr/samples/sensor/ @nrfconnect/ncs-low-level-test
 /scripts/twister/alt/zephyr/tests/drivers/ @nrfconnect/ncs-low-level-test
+/scripts/twister/extended/                @nrfconnect/ncs-low-level-test
+/scripts/twister/extended/zephyr/samples/sensor/qdec/ @nrfconnect/ncs-low-level-test
+/scripts/twister/extended/zephyr/samples/subsys/settings/ @nrfconnect/ncs-low-level-test
 
 # Share
 /share/                                   @nrfconnect/ncs-co-build-system