samples, tests: remove usage of space-separated lists

Convert them to native YAML lists. Support for space-separated
lists was deprecated in Twister a long time ago.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>

tests/net/conn_mgr_monitor/testcase.yaml

@@ -1,7 +1,9 @@
 common:
   min_ram: 16
   depends_on: netif
-  tags: net iface
+  tags:
+    - net
+    - iface
 tests:
   net.conn_mgr.nodad:
     extra_configs:

tests/net/dhcpv4/server/testcase.yaml

@@ -1,7 +1,9 @@
 common:
   depends_on: netif
-  tags: net dhcpv4
-  # eventfd API does not work with native_posix so exclude it here
+  tags:
+    # eventfd API does not work with native_posix so exclude it here
+    - net
+    - dhcpv4
   platform_exclude:
     - native_posix
     - native_posix/native/64

tests/net/dhcpv6/testcase.yaml

@@ -1,6 +1,8 @@
 common:
   depends_on: netif
-  tags: net dhcpv6
+  tags:
+    - net
+    - dhcpv6
 tests:
   net.dhcpv6:
     extra_configs:

tests/net/icmp/testcase.yaml

@@ -1,6 +1,8 @@
 common:
   depends_on: netif
-  tags: net icmp
+  tags:
+    - net
+    - icmp
 tests:
   net.icmp.offloaded:
     extra_configs:

tests/net/lib/coap_client/testcase.yaml

@@ -4,4 +4,6 @@ tests:
   net.coap.client:
     platform_allow:
       - native_sim
-    tags: coap net
+    tags:
+      - coap
+      - net

tests/net/wifi/wifi_nm/testcase.yaml

@@ -6,7 +6,9 @@ tests:
     extra_args:
       # Will be ignored for other platforms
       - CONFIG_NRF_WIFI_BUILD_ONLY_MODE=y
-    tags: wifi net
+    tags:
+      - wifi
+      - net
     platform_exclude:
       - rd_rw612_bga/rw612/ethernet # Requires binary blobs to build
       - frdm_rw612 # Requires binary blobs to build