samples: lora: Add harnesses for execution with twister

Lora samples are missing harnesses and hence are reported
failed by default by twister.
Add required harnesses to be able to detect correct and faulty
test executions.

Fixes #42159

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>

samples/drivers/lora/receive/sample.yaml

@@ -6,3 +6,8 @@ sample:
 tests:
    sample.driver.lora.receive:
      platform_allow: 96b_wistrio rak4631_nrf52840 nucleo_wl55jc
+     harness: console
+     harness_config:
+      type: one_line
+      regex:
+        - "<inf> lora_receive: Synchronous reception"

samples/drivers/lora/send/sample.yaml

@@ -6,3 +6,8 @@ sample:
 tests:
    sample.driver.lora.send:
      platform_allow: 96b_wistrio rak4631_nrf52840 nucleo_wl55jc
+     harness: console
+     harness_config:
+      type: one_line
+      regex:
+        - "<inf> lora_send: Data sent!"

samples/subsys/lorawan/class_a/sample.yaml

@@ -6,3 +6,8 @@ sample:
 tests:
    samples.lorawan.class_a:
      platform_allow: 96b_wistrio nucleo_wl55jc
+     harness: console
+     harness_config:
+      type: one_line
+      regex:
+        - "<inf> lorawan_class_a: Joining network over OTAA"