[nrf fromtree] samples: nordic: nrf_sys_event: test SOC_NRF_FORCE_CONSTLAT

Validate that `CONFIG_SOC_NRF_FORCE_CONSTLAT=y` compiles.

Signed-off-by: Jordan Yates <[email protected]>
(cherry picked from commit 75cb327)

Author: JordanYates

samples/boards/nordic/nrf_sys_event/sample.yaml

@@ -1,30 +1,34 @@
 sample:
   name: nRF System events
+common:
+  harness: console
+  harness_config:
+    type: one_line
+    regex:
+      - "constant latency mode disabled"
+  platform_allow:
+    - nrf52dk/nrf52810
+    - nrf52dk/nrf52832
+    - nrf52833dk/nrf52820
+    - nrf52833dk/nrf52833
+    - nrf52840dk/nrf52811
+    - nrf52840dk/nrf52840
+    - nrf5340dk/nrf5340/cpuapp
+    - nrf5340dk/nrf5340/cpunet
+    - nrf54h20dk/nrf54h20/cpuapp
+    - nrf54h20dk/nrf54h20/cpurad
+    - nrf54l15dk/nrf54l15/cpuapp
+    - ophelia4ev/nrf54l15/cpuapp
+  integration_platforms:
+    - nrf52840dk/nrf52840
+    - nrf5340dk/nrf5340/cpuapp
+    - nrf5340dk/nrf5340/cpunet
+    - nrf54h20dk/nrf54h20/cpuapp
+    - nrf54h20dk/nrf54h20/cpurad
+    - nrf54l15dk/nrf54l15/cpuapp
+    - ophelia4ev/nrf54l15/cpuapp
 tests:
-  sample.boards.nordic.nrf_sys_event:
-    harness: console
-    harness_config:
-      type: one_line
-      regex:
-        - "constant latency mode disabled"
-    platform_allow:
-      - nrf52dk/nrf52810
-      - nrf52dk/nrf52832
-      - nrf52833dk/nrf52820
-      - nrf52833dk/nrf52833
-      - nrf52840dk/nrf52811
-      - nrf52840dk/nrf52840
-      - nrf5340dk/nrf5340/cpuapp
-      - nrf5340dk/nrf5340/cpunet
-      - nrf54h20dk/nrf54h20/cpuapp
-      - nrf54h20dk/nrf54h20/cpurad
-      - nrf54l15dk/nrf54l15/cpuapp
-      - ophelia4ev/nrf54l15/cpuapp
-    integration_platforms:
-      - nrf52840dk/nrf52840
-      - nrf5340dk/nrf5340/cpuapp
-      - nrf5340dk/nrf5340/cpunet
-      - nrf54h20dk/nrf54h20/cpuapp
-      - nrf54h20dk/nrf54h20/cpurad
-      - nrf54l15dk/nrf54l15/cpuapp
-      - ophelia4ev/nrf54l15/cpuapp
+  sample.boards.nordic.nrf_sys_event: {}
+  sample.boards.nordic.nrf_sys_event.force_constlat:
+    extra_configs:
+      - CONFIG_SOC_NRF_FORCE_CONSTLAT=y