[pipsolar] Use register_apply_action for output.pipsolar.set_level (#19685)

tests/components/pipsolar/common-actions.yaml

@@ -0,0 +1,7 @@
+button:
+  - platform: template
+    name: Pipsolar Set Level
+    on_press:
+      - output.pipsolar.set_level:
+          id: inverter0_battery_recharge_voltage_out
+          value: !lambda return 49.0;

tests/components/pipsolar/test-actions.esp8266-ard.yaml

@@ -0,0 +1,8 @@
+substitutions:
+  tx_pin: GPIO0
+  rx_pin: GPIO2
+
+packages:
+  uart: !include ../../test_build_components/common/uart/esp8266-ard.yaml
+  pipsolar: !include common.yaml
+  actions: !include common-actions.yaml