.github/test-spec: adde samples/ipc/ to scope

Added testcase samples/ipc/ as default testing set.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>

Author: nvlsianpu

.github/test-spec.yml

@@ -262,6 +262,7 @@
   - "subsys/bluetooth/*"
   - "subsys/caf/**/*"
   - "subsys/partition_manager/**/*"
+  - "samples/ipc/**/*"
 
 "CI-desktop-test":
   - "applications/nrf_desktop/**/*"