samples: sensor: isl29035: Align sample definition

Add fixutre as external hw is required.
Add regex.

Signed-off-by: Piotr Kosycarz <piotr.kosycarz@nordicsemi.no>
diff --git a/samples/sensor/isl29035/sample.yaml b/samples/sensor/isl29035/sample.yaml
index 086e4ee..66652b6 100644
--- a/samples/sensor/isl29035/sample.yaml
+++ b/samples/sensor/isl29035/sample.yaml
@@ -7,3 +7,9 @@
     platform_allow: nrf52dk/nrf52832
     integration_platforms:
       - nrf52dk/nrf52832
+    harness: console
+    harness_config:
+      type: one_line
+      regex:
+        - "Ambient light sense"
+      fixture: fixture_isl29035